developmental aspects of motor short term...

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DEVELOPUEITAL ASPECTS OF

BOTOR SHORT TERH HEl4ORY

John Thomas Corlett

B . S c W r r s f , B r o c k UPieersity, t9WA - -

R. Sc. (Kines io logy ) , Simfm Praser u n i v e r s i t y , 1977

A THESIS SUBMITTED II PARTIAL PULPILLflEIT OF i

THE REQUIREHEITS F O B THE DEGREE OF

DOCTOR OF PHILOSOPHY

In The Department

f John Thomas C b r l e t t ,979

S I ~ O H PR&B U B ~ V B R S I T Y

- - - - - - - - - - - - - - - - -- - - - - - -- - -- - - - -- - -

All rights reserved. Phis t h e s i s may not be reproduced in w h o l e or ira part by photocopy or other m a n s v i thont - - -- - - - --- -

permission of the author,

Page 4

w

PARTIAL COPYRIGHT LICENSE --- -

I he reby g r a n t t o Simon F r a s e r u n i v e r s i t y t h e r i g h t t o lend

my t h e s i s or d i s s e r t a t i o n ( t h e t i t l e of which i s shown below) t o u s e r e - .

of t h e Simon F r a s e r U n i v e r s i t y L i b r a r y , and t o make p a r t i a l o r s i n g l e

/. c o p i e s on ly f o r - s u c h u s e r s o r i n r e sponse t o a r e q u e s t from t h e l i b r a r y

- - - - - -

of any o t h e r u n i v e r s i t y , o r o t h e r e d u c a t i o n a l i n s t i t u t i o n , on i t s 'own - - - - - -

behalf o r f o r one of i t s u s e r s . 1 f u r t h e r a g r e e t h a t permiss ion f o r

m u l t i p l e copying of t h i s t h e s i s f o r s c h o l a r l y purposes may be g r a n t e d

by me o r t h e Dean of Graduate S t u d i e s . It is unders tood t h a t copying

or p u b l i c a t i o n of t h i s t h e s i s f o r f i n a n c i a l g a i n s h a l l n o t be al lowed

wi thou t my w r i t t e n permiss ion ,

, f

T i t l e of T h e s i s / D i s s e r t a t i o n :

Author :

( s i g n a t u r e )

(name ) 9

Page 5

C

BASE: John Thomas Corlett U

DBGREE: Doctor of Philosophy I \ _ _

TITLE OF THESIS: Developmental ~ s ~ & t s O f lotor Short Tera Memory

Chairman: Dr. E.V. BanisQr

- - T - S . Dictinson

- Senior Supervisor

* ~ r . 6.1. Diesert

Dr. Vi to l o d i g l i a n s D e p a r t m e n t Of Psychology

S i m o n Praser Uni rers i ty

--- - _ D r . Ian Oilliars External Bxaniner

Department of Kinesiology Univers i ty of wate4loo

- - - - - - --- - - - - - - - - - - - - - -

Date Approred: Augus t 16th. 1979,

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Iinety school children, 30 in each of t h r e e a g e groups, were

t e s t e d u s i n g a s l i d e bar for their ability to reproduce linear

arm p o s i t 1 oning movements i n a s h o r t t e r a memory paradigm. Three

separate experiments mere conducted using t h e sa&e s u b j e c t s i n - --- - -

e a c h experiment .

The f i r s t experiment tested the effects of Roveaent length,

r e t e n t i o n i n t e r v a l l e n g t h , and available movement cues on

reproduction of a c r i t e r i o n movement. Subjects reproduced longer

movements with g r e a t e r a b s o l u t e error than shorter o n e s in all

age groups: the effect of movement length on absolute error was

g r e a t e r on t h e youngest children. A d e t e r i o r a t i o n i n criterion

reprodt l c t ion a s measored by incraasimg a b s o l u t e error aldo.

accorred as the length of the r e t e n t i o n interval i n c r e a s e d from 0

t o 30, s e c o n d s . Again, t h e effect was g r e a t e r for younger children

t h a n for older o n e s , Having dis tance and Xocation in format ion

a v a i l a b l e produced s l i g h t l y less abso lute error than reproduction

w i t h location i n f o r m a t i o n a l o n e for a12 age groups. hs measured - by c o n s t a n t error, a l l age groups d i s p l a j o d a tendency t o

a - tmdar shoot-cr%teri&-tot%mnts amtlr-m&em~*hgg-a~td~--~- -p---p

Page 7

T h e second experiment tested the ability af c h i l d r e n t o

exercise cogni t ive c o n t r o l over motor behavionr i n three

a n d i t ions of task r e l e v a n t and task irrelevan't i n f o r n a t i o n .

Relative t o control c o n d i t i o n s i n v h i c h no i r r e l e v a n t information e.

uas p r e s e n t , sub-jects of a l l ages were affected by a m u l t i p l e

t r i a l s design in which no directed f o r g e t t i n g was possible,

Younger subjects were .ore affected than o l d e r ones suggesting an

6 increased capacity for cognitive c o n t r o l in o l d e r c h i l d r e n . I n a

s i n g l e trials des ign Frt vhich d i r e c t e d forgettiag was p o s s i b l e , -X

older subjects were capable of exert ing a greater degree of

cognitive c o n t r b l than younger ones. decrement i n performance

r ~ l a t i v e to controls at a l l ages was evident, however, i n d i c a t i n g

. t h a t e v e n t h e o l d e s t subjects a r e h i g h l y s u s c e p t i b l e to proact ive

i~ terference .

The t h i r d experiment showed t h a t a l l subjects a r e a f f e c t e d

by the interpolated a c t i v i t i e s i n a r e t r o a c t i v e i n t e r f e r e n c e

pyadig. osing absolute error a s t h e dependent measure. Mo t

significant interaction between i n t g r f e r e n c e and age was showp

ixfdicati n g t h a t older and younger s u b j e c t s are equa l1 y a f f e c t e d . d '

I n a d d i t i o n , resalts concerning t h e effect of increased o r i g i n a l

learning on retroact5ve ZnterTerence u s r e ~biained: &owever, bl

s n b f e c t s in h i g t or ig inal fearsirrg graprpq pro&nceh greater

i n t e r f e r e n c e effects than t h o ~ e i n loar o r i g i n a l learning grovps.

Page 8

The r e s u l t s are d f s c u s s e d in relation to botil the basic - conc3pts of sotor skills learning and performance ifereloped with

m

adul t s . In general. it is concluded that those concepts are

parsimonious ones, holding true for the children tested in this

study. Certain results are discussed in the contex t of possible

proactive interference inherent in the experimental designs.

Practical appltcations t o the teaching of motor skills are also

d i s c u s s e d .

Page 9

T a b l e Of contehts Z

Approval Page ii

Abstract Page iii

List O f Tablas i Page v i i i .

L i s t O f f i g u r e s Page ir

L i s t O f Appendices . t

Page x

CHAPTER 1 I n t r o d u c t i o n Page 1

cBbPTER 2 Experiment 2 u'

2a. I n t r o d u c t i o n Page 25

i, Boveaent Length Page 25 ii, R e t e n t i o n Interval Page 27

iii. flovement Cues Page 28 i v . Dependent Error n e b s u r e s Page 31

2b. Experimental Des ign and Uethods

- 1

i . Hypotheses Page 3 3 f

ii, Subjects Page 33 iii. Bpparatus Page 3 5

i v . Design and k n a l y s i s . Page 38 V. Procedure .Page 39

2c. Results Page 43 - 1

2d. D cussion Y - i. 45veaent Length page. 55

ii. Retention Interval Page 64 iii, govement Cues Pag.0 7 1

v Interaction Effects a Page 7 7 - .

CHAPTER 3 Experiment 2

3a. ~ n t r o d u c t i o n page 8 5 \

Page 10

CHAPTER 4

CHAPTER 5

Bibl iography

v i i

3b. Experimental Design and Methods

i, Hypotheses Page 8 8 ii, S u b j e c t s Page 88

iii, Apparatus Page 8 9 i v . Design and A n a l y s i s Page 8 9

v. Procedure Page 9 1

3 Resu l t s Page 92

3d. - ~ i s c a s s i a n Page 98

Exper iment 3

4a. Introduction Page 104

4b. Experimental Design and Bethods

i. H y p o t h e s e s Page 107 ii, Subjects Page 108

iif . Apparatus Page 108 iv. Design and b n a l y s i s Page 108

V. P r o c e d u r e Page 109

Qc, Results Page 110

4d. D ~ S C U S S ~ O ~

i. ~etrortctive Interference Effects Page 117

ii, O r i g i n a l L e a r n i n g Effects Page 119

Gsneral Discussion Page 121

Page 128

Appendix 1 Page 137 -

Page 11

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" . - Figure # Description 'of Figure * . . page *

r Y * * 7

? ~ n f o r i a t i o o Processing Model , 8 , I - >

2 Huaan ~ e r f o r m a n c e nodel . , 22 a

3 '?

37 S l i d e Bar- \

I 6, .r

4a Absolute Error v s . , Hovement Length '58 *-

46 - - - -

Constant Error vs. Flovement Length 3 9

Variable Error vs. lloveaent Length

Absolute Error v s , Retention Interval rl

c o n s t a n t Error' vs. Retention I n t e r v a l 4

Variable Error vs, Retention Interval 2

Absolute, Error v s . Movement Cues

.Constant Error v s , Movement Cues

variable Error vs. Movement Cues .

- l b s o l u t e Error rs. aorement?)cngt h ( g r o u p i n g by ref e n t i o n i ~ t e r v a l )

hbsolate Error v s . aoveoent Length (grouping b g rovement cues)

Absolute Error, vs, Proactive I n t e r f e r e n c e Design d Ccnstant E r r o r vs. Proactire Interference Design

Page 13

'S , Appendix # ~

A poster io~i aa in . effects

Page

analysis of s i g n i f i c a n t in ~ x p e r i ~ e a t s 1, 2 , and 3 . 137

Page 14

, &

3

CHAPTER 1

I n t r o d u c t i o n

For c e n t u r i e s , scientists h a v e been c o n c e r n e d k i t h human

s t r u c t u r e and i t s r e l a t i c n s h i p to fu .nc t$cn , F o r e x a m p l e , i n ths

e a r l y 1 6 t h century, G a l i l e o (1564-1542) a n d Borel l i (1608-1679)

uere e x p l o r i n g t h e n a t u r e o f size and human m o t i o n . L i k e t h e > . more g e n e r a l studies of h u a a n s t r u c t u r e and f u n c t i o n , the

L

' s p e c i f i c s t u d y c f . g r o w i n g c h i l d r e n a l s o h a s a l o n g history.

Between 1759 and. 1776, d e l o n t b e i l l a r d s t u d i e d the g r o w t h 4 of h i s

son ani t constructed u,hat ue ndw recognize a s growth displacement

and y e l o c i t y .?6;urves. Since then, the s t u d y of growth, or a u x o l o g y

a s i t i s c o n t e m ~ o r a r i l y c a l l e d , h a s p r o g r e s s e d g r e a t l y . The #

increased in teres t in t h e workings of t h e human b o d y inevitably'

led t o ths study of children since t h e y are a subject p p p n l a t i o n

along w h y e sost noticeable c h a r a c t e r i s t i c s i s the 'ra'pid chang p \

w h i c h %cur3 i n size and t h e ability 'to perfor. p h y s i c a l t a s k s .

Several e x c e l l e n t r e v i e w s Qn the general trends of p h y s i c a l

growth have been p u b l i s h e d . .Both Thompson (1942) a n d Tanner

* (1362, 1378) among others hare elucidated t h e f u n d a s e n t a l tenets

of s i z e , s h a p e , ~ r a p o r t i o a , and c o m p o s i t i o n a s t h e y are a f f e c t e d --

by c h i l d growth. These reviews reflect the r e c o g n i t i o n of c h i l d -

development a s an a r e a of major c o n c e r n i n human b i o I c g y .

Page 15

Uhi1-c). many of the c h a r a c t e r i s t i c s of p h y s i c a l g r o w t h are

o b v i a u s , t h e p r o g f e s s of p s y c h o l o g i c a l d e v e l o p m e n t i s sometimes

Bore s u b t l e . It is no less d y n a m i c , h o u e v e r . J u s t as a book .

cannot be j u d g e d b y its cover, t h e p o t e n t i a l o f an i n d i v i d u a l f o r i

p h y s i c a l p e r f o r m a n c e i s d e f i n e d by more t h a n p h y s i c a l *-3

c ~ a r a c t e r i s t i c s a l o n e . T h i s is p a r t i c u l a r l y important when

considering children whose l e a r n i n g a s they g r o w represents a

large contribution t o t h e i r ability t o p o r f o r m motor skills. w

I

The s t u d y of learning h a s o c c u p i e d a p r o m i n e n t p l a c e i n

p s y c h o l o g i c a l r e s e a r c h since the l a t e 1 9 t h c e n t u r y a n d , before

t h a t , in t h e minds of p h i l o s u p h e r s since a n c i e n t times. L e a r n i n g I

theories a n d t h e experiaental a t tempts t o v a l i d a t e o r d i s p r o v e

thea c a n t race t h e i r l i n e a g e t o t h e e a r l y wqitfngs of E b b i n g h a u s Q

(1885), T h o r n d i k e ( 1 8 9 8 ) , a n d Pa 'v lov ( 1 9 2 7 ) ; However. i t was

Hatson ( 1 9 2 0 ) who may be thought o f a s the first a d v o c a t o of t h e

f i r s t aaj&-learnf ng t h e o r y , C o n n e c t i o n i s m . ~ e . a n d those who I

followed h i s l e a d s o c h a s G u t h r i e ( 1 9 5 9 ) . ~ d l l ( 1 943) , a i d ~

S k i h n e r (1953, f 957) , d i d much t o a d v a ~ c e t h e concepts o f how .

human conditioning a n d l e a r n i n g o c c u r s , based o n one of ths major

n n d + r f y i n g premises t h a t these p h e n o a e n a o c c u r a s t h e r e s u l t

of t h e c o n t i g u i t y of stimulus and r e s p o n s e . Indeed, t h e

\ b e h a v i o u r i s t a p p r o a c h still d i c t a t e s today much of how we

perceive learning t o take p l a c e although our thinking on t h e

s u b j e c t has been m o d i f i e d .

Page 16

C o n n e c t i o n i s m i s not w i t h o u t i t s l i m i t a t i o n s , however. There

a r e many e x a m p l e s of l e a r n i n g w h i c h a r e v e r y d i f f i c u l t i f n o t

i s p o s s i b l e t o ' e x p l a i n w i t h i n a s t r ic t S-R fraaeuork, f o r e x a m p l e ,

l a t e n t o l e a r n i n g . T h e s e l i m i t a t i o n s spawned the second great

schoo l of l e a r n i n g t h e o r y , C o g a i t i v i s m , Led by Tolman (1932 , Z

1949), t r a d i t i o n a l c o g n i t i v e l e a r n i n g $ h e o r y stressed t h e

importance of the i n d i v i d u a l ' s a b i l i t y t o o r g a n i z e aria p r o c e s

s t i m u l i b o f o r e a respocse is e l i c i t e d . arguing t h a t responses d o

n o t a l w a y s s i m p l y fol low s t i m u l i r e f l e x i v e l y .

D e s p i t e t h e concern o f b o t h C o n n e c t i o n i s m and C o g n i t i v i s m

with e x p l a i n i n g b e h a v i o u r , studies of l e a r n i n g l a r g e l y neglected " -

t h 5 d z t a i l s of how t h e motor p a t t e r n s of which the o b s e r v e d

b 3 h a v i o u r was c o m p r i s e d were. learned, This n e g l e c t w q s summar i zed

b e s t b y G u t h r i e who described the r a t s i n Tolauanas maze as being - " b n r i s d i n t h o u g h t 1 * , + o t a l l y u n a b l e to move anywhere i f r e q u i r e d

t o l e a r n only on Toltaan's terms. It is o n l y r e l a t i v e l y r e c e n t l y 4

that t h e ways i n which we learn t o perfcrn motor s k i l l s have been

i n v e s t i g a t e d a s t h o r o u g h l y a s the w a y s that v e r b a l s k i l l s and - 1,

w

problew s o l v i n g h a v e been s t u d i e d , To this end, new c o n c e p t u a l

frameworks for d e a l i n g v i t h motor l e a r n i n g and p e r f o r m a n c e have

s v o l v s d ( for example, t h e i n f o r m a t i o n processing a p p r o a c h f t o be

3 i s c u s s e d later). T h e s e new p o i n t s of v i e w are a d m i r a b l y s u i t e d

' t o r e s e a r c h w i t h c h i l d r e n a n d c c u l d p r o v i d e much n e e d e d i n 6 i g 6 t

i n t o growth a n d p h y s 3 c a l p e r f o r m a n c e . 1

-7

Page 17

i n t o the d e v e l c ~ a e n t a l a s p e c t s of m o t o r s k i l l s h a s not t a k e n 7

advantage o f t h e a v a i l a b l e t s c h n i q u e s , o p t i n g f o r s more

proauc t - o r i e n t e d , o r result o r i o n t e d v i ew r a t h e r than - c-

i n v e 3 t i g a t i n g and u l t i a a t e l y u n d e r s t a n d i n g t h e processes

s u b s e r v i n g t h c s ~ r e s u l t s . w-4

Growth , m a n i f e s t i n g i t s e l f i n t h e s i z e , s h a p e , a n d

proportionality c h a r a c t e r i s t i c s of the p e r f o r m e r , i s only one

U: f a c t o r p r o d u c i n g c h a n g e s i n p e r f o r m a n c e , Hany o t h e r

c o n s i d e r a t i o n s such as sense a c u i t y , p e r c e p t i o n , a n d i n t e l l i g . e n c e "-

h a v e been summar ized by Singer ( 7 ) . Some of t h e s e Farameters

h a v e been i n v e s t i g a t e d a s t h e y change w i $ h a g e . For example,

H o d g k i n s (1973) and E c k e r t and E i c h o r n (1977) h a v e shown t h a t

siaple r e a c t i o n time d e c r e a s e s d u r i n g c h i l d g r o w t h kysa@out 50% - b e t w e e n the ages of 6 a n d 19. S i n g e r (1969) h a s r e p o r t e d

d i f f e r e n c a s i n d i s c r i m i n a t i o n r e a c t i o n ' t i m e b e t w e e n t h i r d a n d

sixth g r a d e r s and demo'nstrated t h a t p e r f ccmance cn complex

perceptual motor t a s k s such a s stabilometer b a l a n ' c e a n d rotor

ip' pursuit a l s o i m ~ r o v e s b e t w e e n the third n d s i x t h g r a d e s . '

However, s i m p l e c h a n g e s i n p e r f o r m a n c e say n o t h i n g i about

l e a r n i n g . The i n c r e n e n t s i n motor p e r f o r m a n c e which r e s u l t from m i

g r o w t h a r e , a t least i n p a r t , due t o t h e fact that t h e c r i t e r i a

o f success of such tasks f a v o u r l a r g e r c h i l d r e n . H a t u r a t i o n m u s t

Page 18

not be c o n f u s e d w i t h l e a r n i n g , a process of r e l a t i v e l y p e r m a n e n t

c h a n g e i n b e h a v i c u r a s t h e r e s u l t of experience o r p r a c t i c e .

A l t h o u g h m a t u r a t i o n a l effects c o n f o u n d o u r a b i l i t y t o i n t e r p r e t

l e a r n i n g e f f ec t s when g r o s s motor t a s k s a r e u s e d , many s t u d i e s o f

this n a t u r e h a v e b e e n dcne . For e x a m p l e , l e a r n i n g of t h r c w i n g

skills a t v a r i o u s ages has f r e q u e n t l y been i n v e s t i g a t e d

( D u s e n b e r r y , ' 1958; Wild, 1938) . - %

Hotor s k i l l s r e s e a r c b w i t h a d u l t s has moved away f rom s i m p l y

c o n c e r n i n g itself w i t h t h e p r o d u c t s of many complex n e a r o m u s c u l a r

o c c u r e n c e s . Running , jumping , a n d t h r o w i n g a r e t h e c u l m i n a t i o n s d

of p r o c e s s e s s w i t h i n t h e performer, no t m o n o l i t h i c e v e n t s .

~ e c o g q i ~ i n g t h i s , r e s e a r c h e r s s u c h as Kay ,(1957) p r o p o s e d t h a t

the performer be t r e a t e d a s a n i n f o r m a t i o n processcr a n d t h i s

a p p r o a c h t o t h e s t u d y of motor p e r f o r a a n c a h a s greatly i n f l u e n c e d

- research since i i n c e ~ t i o n . *' T

T h e v i e w of man a s a n i n f o r m a t i o n p r c c e s s o r r e ~ r e s e n t s a

c o n s i d e r a b l e departure from more w e l l - e s t a b l i s h e d Connectionist '. b

i n t e r p r e t a G o n s of b e h a v i o u r . The study cf l e a r n i n g , o r p e r h a p s

sore p r o p e r l y b e h a v i o u r , h a s a l c n g s t a n d i n g t r a d i t i o n o f , ,

w

s $ i ~ u l u s - r e s p o n s e c o n t i g u i t y a p p r o a c h e s . Such i s s u e = a s d r i v e ,

a a t i v a t i o c i and h a b i t s t z s n g t h have been central to our i

A u n d e r s t a n d i n g af the learninq process since the e a r l y p a r t o f t h e

- 2 0 t h c e n t u r y ( H i l l , 196 3) .' However, t h e H u l l i a n a n d S k i n n e r i a n 'a

Page 19

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r- 1

abl of t h e a r e a s i n c o n d i d e r a t i o n is t h e c o n c e p t of memory since

all a r e d i r e c t l y or indi'rectly a e a s u r e d as a f u n c t i o n o f

s o m e t h i n g r e a e m b e r e d or f o r g o t t e n e i t h e r i n t h e shor o r l o n g

term. i ,

It is useful -at t h e o u t s e t t o s t a t e t ha t ; as a n a n a t o m i c a l

or physiological entity, meaory h a s nev& b e e n kdedentified 6'

a l t h o u g h much f e s e a r c h i n t h i s area h a s been u n d e r t a k e n . As. the

knowledge of the molecnlar e v e n t s r e s p o n s i b l e f o r the f u n c t i o n o f F

the human body i n c r e a s e d , n u s e r o u s t h e o r i e s were advanced i n t h e

attp,n!pt t o explain t h e u a y i n which memory *workedm. Disruptive

t e c h n i q u e s s u c h a s electroconvulsive shock (ECS) p r o v i d e d

e v i d e n c e t h a t there was a n e l e c t r i c a l component of memory (for

e x a m p l e c i o r o v e r a n d S c h i l l e r , 1965) . However, the retrograde

effects of ECS are s h o r t - l i v e d a n d r e s e a r c h ' e a p h a s i s s h i f t e d Z

t o w a r d i d e n t i f y i n g a "memory moleculen which c o u l d sgrve a s a

l o n g term store, a system which better a c c o u n t e d for t h e common

wisdod s u r r o u n d i n g memory, T h i s comaoh wisdom r e g a r d i n g t h e &.

s t a b i l i t y of long term menory (a s t a b i l i t y not c o n s i d e r e d p r e s e n t '

i n t h e e lectr ical p r o p e r t i e s of t h e n e r v o u s system) was givkn

soae credence by the d e m n s t z a t i o n t h a t f n t e ~ - a n i s a l +ransfer of

mesoty v a s possible ( a l t h o u g h the e v i d e n c e ras n o t tharo&#dy . c o n v i n c i n g ) . I n both P l a n a r i a (LlcConnell , 1962) a n d rats (Babich ,

J a c o b s o n , Bubach, and J a c o b s o n , 1965) , some transfer of memory t o

- a r e c i p i a n t animal was shown when h o n o g e n a t e s of b r a i n t i s s u e

Page 25

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L

reason ing which snp)ports the t u o stage theory (5cr e x a m ~ l e , a .

Underwood, 1965; Kofers, 1366) . They have shown t h a t e r r o r s i n

r e c a l l f o l l o w i n g short term f e t a n t i o n intervals are of an

acoustic k i n d , t h a t is, s i ~ i l a r sounding words are confused with 9

each o t h e r . ow ever , f olloving l o n g e r r e t e n t i o n i n t e r v a l s , the

errors i n r e c a l l a r e of a semantic n a t u r e , with words of similar

meaning b e i n g s u b s t i t u t e d for those o r i g i n a l l y l earned . Tbis d

i m p l i e s t h a t a d i f f e r e n c a i n neacry r e p r e s e n t a t i o n cccurs betueen

t h e s h o r t a n d l o n g tar., again supporting t h e d e l i n e a t i o n of t h e

a two s t a g e s . #

O f the t u o hypothes i z i sd s t a g e s , short term memgxy i s t h e

more frequently i n v e s t i g a t e d today, l a r g e l y because -cf

e x p e r i a e n t a l c o n v e n i e n c e , b u t a l s o because inf orna tGn s t o r e d ' i n

long term a e n o r y is h i g h l y resistant t o such phenclena a s

f o r g e t t i n g . The p r o p e r t i e s of l o n g term memory were o f t e n s t u d i e d

during t h e e a r l y pears .of memory research (see Stelrach, 1374) , leaving s h o r t term recall a s fertile research ground i n recant

years, I n addition, the dynamic p r o c e s s s s of nsacry occur during

t h e short term when r a t e r i a l is first being a s s i m i l a t e d and t h e

research s ff ctrt Bas j u s t i f iabf y conesntrate& on i h e s e & y a % e i e -

Page 28

~ l t h o u g h many o f t h e basic concepts i n v e r b a l l e a r n i n g and

memory have been adap ted t o t h e motor domain, t h e ensuing /

p r o l i f e r a t i o n of d a t a generated h a s been o n l y i n f r e q u e n t l y

collected u s i n g c h i l d s e n a s . subjects. G e n e r a l l y , studies

p e r f o r m e d an c h i l d r e n h a v s s t r e s s e d t h e v i s u q l sy,cteiP. F o r

- example , Baqen (1967) a n d D r u k e r a n d Hagen (1969) examined t h e

d e v e l o p m e n t a l t r e n d s i n p r o c e s s i n g t a s k - r e l e v a n t and

task-irrelevant' i n f o r a a t i c n and c o n c l u d e d t h a t young c h i l d r e n do

not disregard +,he . n n i n f c r m a t i v e inf orata I ion i n a v i s u a l s t i ~ u l u s

a r r ay a s well a s o l d e r c h i l d r e s . I n a d d i t i o n , they f o u n d t h a t

t h e r e is a n a g e dependent i m p r o v e m e n t i n t h e scanning cf a n a r r a y . \

f o r r e l e v a n t , S n l c r n a t i o n . S r o u f e ( 197 1) and ~ r " u ~ s k i a n d Bogle <

(1978) s u g g e s t e d a reason fo r t h i s , s t a t i n g that young c h i l d r e n

m a i n t a i n a less stable state of a t t s n t i o n d u r i n g s h c r t term.

aemorp tasks. ' R a i t h , Harrison, S h i e n g o l d , p n d Hindes ( 1 970) a n d

( H a i t h , 1371) h a v e s h o w n d e v e l o p m e n t s 1 changes i n s h o r t - term

v i s u a l memory. Baring b e e n shown f o u r gecretr ic f i g u r e s for 150

asec, 5 year o l d 6 c o u l d recall only two a f t e r a brief retention

per iod v b e r e a s a d u l t s c o u l d r e g u l a r l y recall a l l four w

successfully. The a u t h o r s s u g g e s t e d t h a t clder children and

a d u l t s employ a rehearsable v e r b a l code d u r i n g such memory t a s k s 4

while y cungor children e n p l o f a n o n - r e h e a r s a b l e visual code.

,' S i n i l a r l y , Conrad f 1571) and F lavell, F r e i d r i c k s , and Hopt (1370)

proposed t h a t rehearsal s t r a t e g i e s c h a n g e with a g e . .

Page 29

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Page 30

T h e c o n c e r n w i t h the p r o c e s s i n g of v i s u a l i n f o r m a t i o n i s n o t

unfounded. V i s i o n p l a y s a n i m p o r t a n t r o l e i n the d e v e l o p m e n t of

s k i l q b g c h i l d r e n . Reiber~ (1968) had 5, 7, a n d 9 year o l d s

p e r f or^ a p i n b a l l p r o p e l l i n g t a s k a n d r e p o r t e d d i f f e r e n c e s

be tween abe g r o u p s i n the a b i l i t y t o perform t h e t a s k o n l y when

v i s u a l i n p u t was n o t a v a i l a b l e . S m o t h e r g i l l (1373) showed no age 'i, t,

differences i n the a b i l i t y t o l o c a l i z e t a r g e t s v i s u a l l y . However,

i f t h e t a r g e t u a s p r e s e n t e d , t h e n ramoved, 3-10 y e a r o l d s were

better t h a n 6-7 year o l d s i n delayed r e c a l l o f the target

p o s i t i o n . ; I n a d d i t i o n , v i s d a l p r e s e n t a t i o n s were remembered by -

, b o t h groups better t h a n p r o p r l o c e p t i v e p r e s e n t a t i o n s . T h e

importance, of v i s u a l i ~ f o r r n a t i o n p r o c e s s i n g i s n o t t o b e

R e c e n t l y , some r e s e a r c h e r s h a v e c o n c e n t r a t e d , not o n a n y

p a r t i c u l a r sensory mode ( t h o u g h c e r t a i n l y cne o r more s e n s o r y

modes a re i n v o l v e d i n a n y p e r f o r m a n c e t e s t ) , but rather on I i

g e n e r a l aspects of short term memory e x p e r i m e n t s u s i n g c h i l d r e n r

as subjects. F o r e x a m p l e , of i n t e r e s t i n terms of s a m p l i n g

+ s n b j e c ts, t h e c o r r e l a t i o n a l r e l a t i o n s h i p b e t w e e n i n t e l l i g e n c e a n d

s h o r t term memory h a s b e e n e x a a i n e d b y Cohen a n d Sandberg ( 1 977) . T h e y p & s e n t e d e v i d e n c e t h a t i n t e l l i g e n c e i s a good predictor of

s h o r t term aemory p e r f o r m a n c e i n reca l l f o r mos t recent itemsSAbut d

n o t i n r e c a l l f s r f i rs t o r l o n g term items, T h e d a t a suggest t h a t

i n t e l l i g e n c e may b e r e l a t e d , t h o u g h not n e c e s s a r i l y c a u s a l l y , t o

Page 31

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Page 32

t o be l e a r n e d . I n a d d i t i o n , o l d a r subjects, u n l i k e younge,r ones,

c o u l d s i r a u l t a n e o u s l y e n c o d e temporal a n d t a m p o r a l a n d s p a t i a l

i n f o r m a t i o n , ' However , s u b j e c t s of 5 a n d 6 years 018 could be 'P

c o n f u s e d i n t h e i r r e c a l l of s p a t i a l l o c a t i o n by t h e n a t u r e of the

= &zi~el o b ~ e ~ " e d b e t r e d n t w o o b j e c t s , p e r h a p s d u e to t h e i n a b i l i t y E

-\ . - t o reject t a s k - i r r e l e v a n t i n f o r m a t i o n .

T u r n i n g t o a more p r o c e s s o r i e n t e d v i ~ w of s h o r t t e r m

meaory, Enmer i ch a n d Bckerman (1978) t e s t e d f i rs t a n d f i f t h a -

" 8

graders on a 30 item set of p i c t u r e s p r e s e n t e d e i t h e r random1 J f c \

, i n b l o c k e d c a t e g c r i e s , o r i n c a t e q o r i e s s o r t e d by t h e s u b j e c t . i #

Recall was e i t h e r free, c u e d , o r c o n s t r a i n e d . The results showed

t h a t c h i l d r e n * s r e c a l l , u n l i k e adults, was i n f l u e n c e d b y - .J

r e t r i e v a l c o n d i t i o n s - a n d n o t b y e n c o d i n g , I n t e r e s t i n g l y ,

L o n g s l e t h a n d Z o l t a n (1978) , i n a test-retsst of grades 1 a n d 2 ,

showed t h a t a g e 0ffects were two times a s great cn o r i g i n a l \

l e a r n i n g t b a n o n r e t e n t i o n itself, i m p l y i n g t h a t t h e c r i g i n a l %*'

\

. * c o d i n g p r o c e s s e s a re p e r h a p s more i o p o r t a n t t h a n i n d i c a t e d b y

Emmerich a n d Ackerman.

R e g a r d i n g t h e v a r i o u s s e n s o r y modes i n r e l a t i c n t o each

- o t h e r , F i s h b e i n , Decker, and Y_i&cox (1977) in a s t u d y cf c h i l d r e n 6

i n grades 1, 2, and 4 r e p o r t e d t h a t o l d e r c h i l d r e n were beiter a t ,-+ '-.x,

r e c o g n i z i n g cJecme<ric f o r m s t h a n y o u n g e r ones b u t t h a t t h e r e was , - i

no difference between i n t r a m o d a l a n d c r o s s - m o d a l recal l . - .

Page 33

C l e a r l y , c h i l d r e n a r e c a p a b l e f s u c c e s s f u l l p . u s i n g many -"S d i f f e r e n t s w s o r y modes d w r i n g short term memory tasks t h o u g h ,

f o r t h e mos t pa r t , $he l i t e r a t u r e h a s c o n c e n t r a t e d on t h e v i s u a l

s y s t e m

I n motor s k i l l s t h e p r o p r k o c e p t i v e m e c h a n i s m s a r e o f p r i m e

. c o n c e r n . As R a r i c k ( 1978) stated: "Very l i t t l e r e s e a r c h of

c o n s e q u e n c e h a s tean. d o n e . . . . i n the a g e r a n g e 5 t o 15 y e a r s n .

Perha'ps t h e larges t d a f i c i e n c y i n motor d e v e l o p m e n t i s i n the

a r e a of the properties o f t h e m o t o r s y s t e m i t s e l f . It is i n t h i s

. direc t icn t h a t r e s 2 a r c h f o c u s . is r e q u i r e d .

I t is u s e f u l when d e a l i n g w i t h a n e v e n t s u c h a s m o t o r I

, p e r f o r m a n c e t o c o n s t r u c t a model u h i c h d e s c r i b e s c o n c e p t u a l l y t h e

r e l a t i o n s h i p s be twoen the h y p o t h e s i z e d c o m p o n e n t s of t h e

p e r f o r m a n c e system. . A m o d i f i c a t i o n , and e l a b o r a t i o n of a model

f rom Corlet t , C a l v e s t , a n d Banister (1978) is shown i n P i g u r e 2.

P r e v i o u s s t u d ' i e s u s i n g s u c h ~ o d e l i (e.g. Ccr le t t , 1977) have

c o n c e n t r a t e d on t h e m a t h e m a t i c a l r e l a t i o n s h i p s between p h y s i c a l

t r a i n i n g and peif o r m a n c e c f s u c h p r e d o m i n a n t l y aerobic t a s k a s

r u n n i n g a n d c y c l i n g . I n t b s c u r r e n t s t u d y , the c e l a t i o n s h i p s

between t h e s - k i l f n l c h a r a c t e r i s t i c s o f t h e p e r f o r m e r and

p e r f o r m a n c e -of a m o t o r t a s k a r e e x a m i n e d . \

Page 34

F I G U R E 2: A HODEL OF A U H A N PERP0RflANC.E

Page 35

Training

Aerobic

C

Strength ,

v

Per forrnance

'.*-t Ski l l ,- _I Psychological

Factors

Page 36

T o i s o l a t e t h e s k i H p l a s p e c t s of p e r f b r m a n c e a s c o m p l e t e i y

a s possible, it i s * n e c e s s a r y t o e l i m i n a t e o r m i n i m i z e t h e

contribution of o the r f a c t o r s , s p e c i f i c a l l y t h e p h y s i c a l t r a i t s

' a n d l e v e l of #@physical f i t n e s s n ' of the p e r f o r m e r . O t h e r

c o n s i d e r a t i o n ' s such a s the p s y c h o l o g i c a 1 s t a t e of t h e performer

(em g. l e v e l of ~ o t i v a t f on) a n d s t a b i l i t y of t a s k characteristics \ ,

between s u b j e c t s must be t a k e n i n t o account a s well. Ths

e x p e r i m e n t a l d e s i g n s and a p p a r a t u s d e t a i l e d h e r e are

m a n i f e s t a t i o n s of + t h e need to deal a s m2ch a s p o s s i b l e v i t h s k i l l

r a t h e r t h a n other c o n f o u n d i n g fac*ors such a s speed, s t r e n g t h , '

a n d a e r o b i c c a p a c i t y . These d e s i g n s a r e c o n c e r n e d vith t h o s e

a s p e c t s of motor d e v e l o p m e n t r e s e a r c h deemed a o s t i m p o r t a n t by

R a r i c k . S p e c i f i c a l l y , t h e y a r e d e s i g n e d t o i n v e s t i g a t e t h e ways

i n which c h i l d r e n use p r o p r i o c e p t i v e i n f o r m a t i o n .

The l i t e r a t u r e reveals a number of f e a t u r e s c o n c e r n i n g the I

inf o r n a t i o n p r o c e s s i n g ' a b i l i t y bf c h i l d r e n a s they matu re . lost

of t h e r a s e a r c h h a s s t u d i e d t h e v i s u a l s y s t e n : however , these -\

f i n d i n g s combined with what i s known of t h e motor s y s t e m allow

t h e f o r n a t i o n of s e v e r a l h y p o t h e s e s r e g a r d i n g t h e d e v e l o p a a n t a l

a s p e c t s o r motor short term memory. T h e major h y p o t h e s i s ardund - which a l l of t h e experiments i n t h i s s t u d y r e v o l v e is t h a t a s

c h i l d r e n grow older , their a b i l i t y t o p r o c e s s p r o p r i o c e p t i v a

i n f o r m a t i o n i n c r e a s e s . Working i n t h e realm of s h o r t term memory, -

Page 37

this gives rise t o several specific hypotheses which form. t h e

basis of t h e e x p e r i a e n t s d e s c r i b e d later i n the t e x t . In

addition, i m p o r t a n t hypotheses t e s t e d u s i n g a d u l t s 'as subjects

have h o t been tested using children. Therefore, within each age

group, several h y p o t h e s e s arise i n d e p e n d e n t of m a t u r a t i o n

effects. These w i l l b e described where appropriate Jn the f o l l o w i n g ,

chapters.

Page 38

CHAPTER 2

~ i p e r i m e n t 1

A. I n t r o d u c t i o n

i. Movement L e n g t h

Laabs (1973) p r e s a d t s d e v i d e n c e t h a t t h e c e n t r a l t e n d e n c y i\ , effect d e s c r i b e d by l e o b a (1909) was a p p a r e n t i n arm p o s i t i o n i n A t a s k s commonly used i n mo to r skills research. The ~ r i n c i p l e

st-atas t h a t short moveBents t e n d t o be o v e r s h o t while l c n q 1

m v e a e n t s t e n d t o b e u n d e r s h o t . Laabss s u b j e c t s moved a l e v e r 0

over a n arc o f 120 with movement e n d p o i n t s f a l l i n g i n cne of

three sectors (40-60°, 6 1-80'. a n d 8 1- i20°) . Hcwements were a l s o

g r o u p e d on t h e basis of their e x t e n t , s h o r t ones being 10, 15,

a n d 20 cm, l o n g ones being 25, 30, a n d 35 cm. O n the b a s i s o f

a l g e b r a i c (signed) error c o m p a r i s o n s , s h o r t movements were 1 /i

r e p r o d u c e d o v e r l y - l o n g , ( t h a t is, a p o s i t i v e a l g e b r a i c error) 1 1

while l o n g movements ae re r e p r o d u c e d o v e r l y - s h o r t ( a n e g a t i v e

a l g e b r a i c errcr) , following a 12 second r e t e n t i ~ n i n t e r v a l .

S e v e r a l studies p r e c e d e d t h a t of Laabs and p r o v i d e d

essentially the samo i n f o r m a t i o n . Lloyd a n d C a l d w e l l (1 956) and

a a r t e n i u k , s h i e l d s , a n d Campbell ( 1972) g a v e s u p p o r t i n g e v i d e n c e

Page 39

of the central tendency e f f e c t on t h e b a s i s o f a l g e t r a i c , o r 1 '

c o n s t a n t , error. Nevertheless, t h e l a t t e r s tudy shcwed no

d i f f e r e n c e s in ' v a r i a b l e e r r o r and s'uggested a c c o r d i n g l g tlhat >

l imb p o s i t i o n receptcrs a r e q u a l i t a t i v e and p rov ide e q u a l l y

a c c u r a t e l o c a t i o n i n f o r m a t i o n independent of the extent of t h e * ' *

movement. One study stands i n c o n t r a s t t o those j u s t

a e n t i o n e d . ~ t e l m a c h 'and ai3so'n ( 1 970) r e p o ~ t e d no s i g n i f i c a h t >

effect on mean c o n s t a n t e r r o r ' for r o t a t i o n a l arm p o s i t i o a i n q

between 25' and 125'.

Stelmach, Kelso, and dccullagh (1 976) had sub jecTs perform 8

I

* b dfl h o r i z o n t a l ar . p o s i t i o n i n g t a s k i n which t h e - moiasents 0 t e rmina ted i n - one of four. s e c t o r s of a 160 a r c , Although t h e *

aa in effect o f ' sectors was found t o be s i g n i f i c a n t for a l l a

depenzent e r r c r measures used ( a l g e t r a i c error, mean squared

e r r o r , and u i t h i n - s u b j & c t e r r o r ) , examinat icn of means b y both ' .

s i m p l e o b s e r p a t i o n and pos t hoc s t a t i s t i c a l a n a l y s i s provides an *

u n c l e a r p i c t u r e a s to t h e n a t u r e of t h e s e c t o r eff,ect. t

Hetl iodclogical d i f f e r e n c e s ( f o r example, dinear movements

vs. r o t a t i o n a l - eovements) and different emphases placed on

r e p o r t e d d e p e n d e n t ? e r r o r measures makes it d i f f i c u l t t o b e

c e r t a i n what t h e bffect of movement extant is on t h e accuracy of

r ep roduc t idn cf c r i t e r i o n soveaents. U i t h c h i l d r e n , development

of movement s k i l l s a p p e a r s t o proceed i n a p r o x i a a l - d i s t a l

Page 40

f a s h i o n , that is, a o r e m e n t s close t o t h e body c e n t r e b ' j l i n e a re

l e a r n e d before n v m e n t s a ay from t h e ceptre l i n e ( C r a t t y, 1967) . t \ \ E x t r a p o l a t i n g fro. this, & n i g h t s p e c n l a t e t h a t l c n g e r

,

moweaents p l a c i n g t h e e n d ~ o i n t f a r t h e r from t h e c e n t r g line would

be more subject t o error upon r a p r o d u c t i o n t h a n s h c r t e r o n e s f o r

which t h s e n d p o i n t i s mors T h e r e is l i t t l e e v i d e n c e f o r

t h i s ir; t h e literature, however, b n l y Stelmach (1970) h a s I .

r e p o r t e d t h a t r o t a t i o n a l p o s i t i o n i n g errors a re l e s s n e a r e s t t h e

v e r t i c a l a n d i n c r e a s e a s t h e movement e n d p o i n t moves of f - c e n t r e .

ii. R e t e n t i o n I n t e rva l .

I n 1359, P e t e r s o n and P e t e r s o n (see also Brown, 1358)

r e p o r t e d t h e r e s u l t i s of what h a s become t h e f u n d a a e n t a l short

t e r a memory e x p e r i m e n t uFon which much s u b s e q u e n t research h a s I)

been based. T h e y p r e s e n t e d t h e i r s u b j e c t s with a l ist of

n o n s e n s e s y l l a b l e s , then t e s t e d t h e i r r e c a l l - a t v a r i o u s r e t e n t i o n

i n t e r ~ a l s f o l l c w i e g p r e s e n t a t i o n . T h e y t h a t , r i t h

i n c r e a s i n g length of the r e t e n t i o n i n t e r v a l (from 0 t o 18

s e c o n d s ) s u b j e c t s re capable of r e c a l l i n g f e v e r of t h e list La c o ~ p o n e n t s . They argued tbat t h i s c o n s t i t u t e d +wi&nce l o sopport

of t r a c e decay i n the s h o r t tera,

Page 41

. . T h e Peterson a n d Peterson e x p e r i m e n t a l p a r a d i g m was a d a p t e d

t o motor short term memory in 1966 by Adams and ~ i j k s t r a uho Ir

stressed t h a t Bcre power would be added t o empirical l a w s

o b t a i n e d f rom ve rba l l e a r n i n g experieents i f t h e y could be shown

tc hold for other responses c l a s s e s . T h e i r subjects moved a -

freely s l i d i n g e l e a e n t along a .eta1 bar to a s top $ 6 6 , 4Bree. or

five times, t h e n waited for up to threa m i n u t s s before a t t e m p t i n g

t o r e c a l l t h e r o v e ~ e n t . T h e results which showed a h = o l u t e e r r o r

i n c r e a s i n g a s the r e t e n t i o n interval lengthened, s u p p c r t e d t h e

t r a c e . h y p o t h e s i s (Brcvn, 1358) , t h a t is, the o r i g i n a l l e a r n i n g

t r i a l ( s ) l eave a "aemory tracew which decays with tire as did t h e

v e r b a l material cf Peterscn and P e t s r s o n , I n a d d i t i o n , Adams a n d

Di j k s t r a illusirate&-a reduction i n a b s o l u t e e r r o r fo r a given

r e t e n t i o n interval wben'+ore n r e i n f orcing t r i a f s u (an a l l n s i o n to / a -

a * t h e S - R a n a l o g y seen by &$ams) were given, .

L

One i m p o r t a n t p r o c e d u r a l c o n s i d e r a t i o n muit be addressed to

properly appreciate d a t a c o l l e c t e d during n o t a r s h o r t tera aenory

e x p e r i ~ e n t s u s i n g l i m b pcsitioning tasks, Laabs (1373) , although

' c e r t a i n l y nut the f i r s t to do so (see Lenba, 1 9 0 9 ) , presented

evidence suggesting that a number of d i f f e r e n t p o t e n t i a l movement

cnes Here a v a i l a b l e t o subjects d u r i n g l i n e a r arm p ~ e t i o n i n g --? ...

e x p e r i m e n t s . H i s d a t a shoved t h a t d i s t a n c e and l o c a t i o n cnes

Page 42

were d i f f e r e n t i a l l y e a f f e c t e d b y f i i l e d a n d u n f i l l e d r e t e n t i o n

i n t e r v a l s . D i s t a n c e c u e e r r o r s , i n c r e a s e d d u r i n g i n c r e a s i n g

- retention i n t e r v a l l e n g t h f a tracs d e c a y ) but uere ' c n a f f e c t e d by

i n t e r p o l a t e d a c t i v i t i e s , ' ~ n the other h a n d , l o c a t i o n c u e errors

uere c o r p a r a t i v f l y r e s i s t a n t t o unfilled r e t e n t i c n intervals but

increased f o l l o w i n g i e t e n t i o n i n t e r v a l s f i l l e d with interfering

activities. Since L a a b s 8 s t u d y , e q u i v o c a l e v i d e n c e h a s been

presented w b i c h leaves the n a t u r e of d i s t a n c e a n d l c c a t i a n c u e s

a n y t h i n g b u t c lear .

. C o n s i s t e n t f i n d i n g s indicate t h a t l o c a t i o n ( t h a t is , * + .

esovement endpoint) c u e s a r e c a p a b l e of being r e h e a r s e d when t h e

o p p o r t u n i t y i s a v a i l a b l e . Bmonq t h e s t u d i e s c o r r o b o r a t i n g t h e ,"

f i n d i n g s of L a a h s (1 9 7 3 1 ~ regarding t h e - n a t u r e < of location c u e s

3re !iarto,niuk ( 1973) , Diewert ( 1 9 7 5 ) . a n d S t e l m a c h , Uallace, a n d

R c C r a c k e n ( 1 3 7 6 ) . T h a t t h k r e i s a rehearsable c o d e subserving

l o c a t i o n is c o n s i s t e n t w i t h w h a t is kncwn o f proprioceptive

aechan i sas (fcr exaapl~, see Kelso a n d Stelmach, 1 9 7 6 ) .

on for tun at el^, t h e findings for distance Cues a r e h i g h l y

ambi q n o u s a n d l e a v e t h e Laabst d e l i n e a t i o n o f d i s t a n c e a n d

location i n some d o n b t . f o r e e l e , w h i l e P o s n e r (1967) and

Roxf e y (137tt f f cund no . a b f f i t y uf subjects to rehearse and r e t a i n Y

aistance informatiua in short 'term r e m x y , Mrteaiak f 1973) a n d

D i e v e r t ( 1 9 7 5 ) fcund t h e c p p o s i t e t o be t h e case.

Page 43

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T o bolster the i n a d e q u a c i e s of t h e i n d i v i d u a l m e a s u r e s ,

s e v e r a l c o m p o s i t e measures h a v e been p r o p o s 3 d . For e x a m p l e , A

Henry (1974) s u g g e s t e d t h e u s e of a single e r r o r measure s imilar

t o t h a t previously m e n t i o n e d . This error tsrm i s o f the form:

In addition, R Q ~ (1976) s u g q e s t e d t h a t a l l errcr m e a s u r e s

(E, a b s o l u t e error, c o n s t a n t error, and v a r i a b l e e r ro r ) b e

a n a l y z e d i n a m u l t i v a r i a t e a n a l y s i s of v a r i a n c e ,

T h e f i n a l word on t h i s fundaol len ta l problem h a s n o t been

- w r i t t e n , A t the present time, s i n c e no l i t e r a t u r e i n motor s h o r t /

term memory of c h i l d r e n i s avai lab le , i t seems a d v i s a b l e t o

report a l l o f a b s o l u t e , c o n s t a n t , a n d v a r i a b l e errors, b e a r i n g i n

mind t h e i r inherent d e f i c i e n c i e s . I n t h i s way, da ta c o l l e c t e d I

using c h i l d r s n a s subjects will, i n t h e i n i t i a l stages, b e

a v a i l a b l e f c r comparison w i t h p r e v i o u s l y - r e p o r t e d a d u l t d a t a

v h i c h is expressed i n terns of all t h r e e d e p e n d e n t measures. i 1

Page 46

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Page 47

tho study. P r i o r a p p r o v a l ' w a s o b t a i n e d from t h e D o p a r t ~ e n t of

K i n e s i a l o g y ~ r a d n a t e S t u d i e s Committee, ..

Thirty chilaren i n e a c h of throe age groups yare tested. Thz

Bean ages of t h e t h r e e groups were 5.8 years,',8.9 years, and 12.5 *

years. Fifteen e a c h of b o y s a n d g i r l s a t i e a c h a g e were t 8 s t e d . b

S i x c h i l d t e n were l e f t handed: for t h e s e s o b j e c t s , te;t p r o t o c o l s * u e r e m a i ~ i t a i n e d a s for ,right handed o n e s except t h a t movemsnts

w e r e performed w i t h t h e l e f t h a n d in-the o p p o s i t e d i r e c t i o n t o

t h o s e a'ade by ri& h a n d e d s u b j e c t s . T h r e e - h f t h a n d a r s were

k i n d e r g a r t e n s , two were g r a d e 3*s, and o n e was a grade 6.. , .

a

--a

These age d i v i s i c n s correspdnded t o - g r a d e s ~ i n d e r ~ a r t e n , 3,

and a combined c l a s s of grades 6 and- 7 . The d a S i g n of t h e s t u d y - was c r o s s - s e c t i o n a l i n n a t u r e , meaning t h a t c h i l d r e n were t ~ s t d d

o n l y once with t h e means f o r e a c h of the a q e groups serving a s a

prototype for c h i l d r e n o f t h a t age . A l o n g i t u d i n a l o r mixed

l a n g i t n d i n a l d e s i g n was n o t f e a s i b l e for t h i s s t u d y d.ue t o t h e

time c o n s t r a i n t s imposed b y s u c h studies,

?A- 1

No a t t e m p t t o categorize subjects o n the b a s i s of p h y s i c a l

o r ps y c h o l a g i c a l maturity was deemed plausible a l t h o u g h s u c h

t e c h n i q u e s are a v a i l a b l e , For e x a ~ p l e , p h y s i o l o g i c a l age can be

deterained p i a s k e l e t a l age and p s y c h o l o g i c a l a g e can b e

determined in numerous ways s u c h a s t h e fl-space c o n c e p t s &

p r e s e n t e d i n t h e n e o - P i a g e t i a n f r amework by Gerson a n d Thomas

Page 48

Page 49

F I G U R E SLIDE BAB APPARATUS

Page 50

Page 51

ware asked * t o rzproduce p rev ious ly l e a r n e d movements w i t h both

d i s t a n c e and l o c a t i o n c u e s a v a i l a b l a , or l o c a t i o n c u e s a lone , 4

a v a i l a b l a . S u h j e c t s performed the t a s k s w i t h eyes t i g h t l y s h u t

t o e l i m i n a t e v i s u a l * i n p u t and subjac ts were al lowed t o v i s u a l l y

' acquaint themselves with t h e appara tus before exper imen ta t ion

began.

iv. Design and Analysis

Experiment # I prov ides d a t a f o r ths performance of a l i n e a r

'l arm ' p o s i t i o n i n g task f o r children i n each of t h e age groups.

Each s u b j e c t perform2d 18 c r i t e r i o n movements whose o r d e r was

randomly ass igned . T h e 1 0 movements were ccmprTsed ?f

ccmbina t ions of t h e fo l lowinq cond i t ions : '

3 r e t e n t i o n i n t e r v a l s of 0, IS, and 30 seconds , 2 r e c a l l L

c o n d i t i o n s , e i t h e r d i s t a n c e + l o c a t i o n c r l o c a t i o n a l c n e , and 3 4

movement l e n g t h s of 10, 20, o r 40 cm. (performing a l l p o s s i b l e

c o n d i t i o r s results i n 3 x 2 x 3 = !8 movements).

Pour attempts a t e a c h endpoint were t e s t e d . Raw d a t a was

collected on p r e v i o u s l y prepared d a t a sheets . - Raw d a t a scores C wore conver tad- to s c o r e s f o r a b s o l u t e e r ro r , c o n s t a n t e r r o r , and

v a r i a b l e error i n t h e ccrnputat ional s e c t i c n of the c o m ~ u t s r

s t a t i s t i c a l package used. The genera tsd e r r o r scor f s wsre

Page 52

s u b j e c t e d to d e s c r i p t i v e statistical a n a l y s i s a n d a n a l y s i s

of v a r i a n c e u s i n g pr.0gram.e BHDPZV e o f t h e B i o m e d i c a l C o m p u t e r

Programs P-Series ( D i x o n and Blown, 1977) . The d e s i g n t e s t e d by

t h e s t a t i s t i c a l a n a l y s i s was a 3 ( a g e s ) r 3(aevemsnt l e n g t h s ) x

3 ( r e t e n t i o n i n t e r v a l s ) x 2 (nmvement cues) f a c t o r i a l d e s i g n w i t h

repeated seasnres a n all b u t t h e f i r s t f a c t o r . T r i a l s effects

were n o t of i n t e r e s t i n t h i s s t u d y acd were n o t a n a l y z e d . In

a d d i t i o n , i n i t i a l a n a l y s e s f o r each a g e group v e r e ~ e r f o r ~ e d t o

ascertain w h e t h e r sex differencas at a n y age b e t w e e n b o y s a n d

girls e x i s t e d . Yhon no s t a t i s t i c a l l y s i g n i f i c a n t d i f f srences a t / d

any aqe between b o y s a n d g i r l s were f o u n d , sex uas n o l c n g e r

c o n s i d e r e d i n subsequen t a n a l y s e s .

V . P r o c e d u r e

An i n t r o d u c t o r y t a l k was given t o each g r o u p a s a w h o l e ,

after which e a c h s u b j e c t was r e m o v e d from c l a s s t o be tested

i n d i v i d u a l l y i n the room ~ r o v i d e d b y s c h o o l a u t h o r i t i e s . Subjects

vere a l l o u e d t o a c q u a i n t t h e m s e l v e s w i t h the s u r r c u n d i n g s a f t e r

b e i n g seated a t t h e t a b l e a n d vere asked f o r their date of birth .

a t t h i s t i n e . T h e f o l l o w i n g set of f a m i l i a r i z i n g i n s t r u c t i o n s

vere given: x - -5

s

Page 53

" T h i s is the a p p a r a t u s we will be using to d o cur

e x p e r i m e n t s . I t is c a l l e d a s l i d e bar and it works like this.

This part, t h e slide ( d e l a o n s t r a t e ) moves along this metal rod,

Why d o n ' t you t r y i t with your r i g h t ( l e f t ) hand? Have a t pour

own speed and in one c o n t i n u o u s movement (TRIAL),

You are gcing to be, making a l l y o u r Pavements with your eyes

c l o s e d . Try ancther one w i t h your eyes. t i g h t l y s h u 4 this time.

B e sure you can't see (TRIAL).

I t is v e r y i m p o r t a n t t h a t you keep your eyes shut d u r i n g a l l '

the movements: when I tell you to 'close y o u r e y e s * , shut them

and keep them s h u t u n t i l I t e l l you to open them again-,-po,you * -,

have any q u e s t i o n s so f a r ? (If so, r e p e a t ' the i n s t r u c t i o n s ) .

Some of the movements will be made from t h e s t a r t i n g

position I g i v e you to a stop that I will move to a p l a c e along

the metal r o d ( d e m o n s t r a t e ) . Let8s t r y a movement to t h e s t o p ,

S i t w i t h your h a n d s on t h e desk i n front of y o u , Close your e y e s .

I w i l l place your hand on t h e n o v e a k l e s l i d e and when 1 s a p Jmove

to t h e stop', move t h e s l i d e t o . t h e stop. Then place your hand -

back on t h e d e s k . (TBIBL, 18cm).

Page 54

1

Open your eyes. ~ f t 6 r you have l e a r n e d , a movement by moving

to t h e s top, I w i l l ask you to repeat it after a waiting p e r i o d .

sometimes I w i l l start you i n the same p l a c e and ask ycu to make

the sane movement again but without the s t o p i n p l a c e to h e l p

you. Other t i n e s , I w i l l s t a r t you i n a different p l a c e and ask

you to Bove t o the place where the stop was. Let's try one of

each k i n d . (TRIALS, 22 cm f o r d i s t a n c e p l u s l o c a t i o n ; _ 12, then 24 =--

w

cm for locaticp a l o n e ) . . '-A

*

Do yon unders tapd e v e r y t h i n g s o f a r or would you l i k e t

over t h e instructions aqain?o& (repeat i f - n q c e s s a r y ) . ,

ahen the e x p e r i m e n t e r was s a t i s f i e d t h a t the sob ject fully

comprehended what was r e q u i r e d , the experiment p r o c e e d e d a s

outlined i n the following i n s t r u c t i o n s spec i f ic to Experiment 1.

"we are going t o do a series of moveaents. I will tell you

how to each movement before ue begin each one. Begin . a n d \ \

end e a c h m'ovement w i t h your hands p l a c e d on the desk i n front of

pan. Each time we do a movement, I w i l l give you these ,

i n s t r u c t i o n s : *

Page 55

F i r s t , I w i l l s ay 'close your eyes' . Then , I w i l l p l a c e your 4

'.- - hand o n t h e s l i d e , When X say naove t o t h e s t o p u , move t h e s l i d e

to the s t o p . Af te r y o u h a v e made t h e aoveaent , p l a c e yonr hand

backhan the t a b l a and reaeaber t o k e e p y o u r eyes shut. Yhen I -

replace y o n r h a n d on t h e s l i d e , 1 w i l l say e i t h e r 'rake t h e same

movement1 which m e a n s t h a t yon m i l l s t a r t i n the same place a n d

move the same d i s t a n c e t o t h l a c e w h e r e the s t o g uas, o r , I P w i l l say *move to where the s t o p was* which m e a n s t h a t you w i l l

be s t a r t i n g i n a different place b u t w i l l move t o uhere t h e s t o p -

was, Then , follcw t h e i n s t r u c t i o n , w h i c h e v e r one i t i s , Then

p l a c e y o u r hand back o n t h e table. You w i l l hawe four t r i e s a t

r e c a l l i n g each movement and I w i l l give y o u i n s t r u c t i c e s on how

t o make the a o v e a e n t t a c h time, After t h e fourth t r y , I w i l l say

' o p e n y o u r epes* and y o n c a n open t h e n t h e n . Do you^ h a v e any

q u e s t i o n s l n (If so, r e p e a t t h e i n s t r u c t i o n s ) .

Porn p u p i l s were subjectively deemed not t o have fully

c o m p l i e d w i t h t h e i n s t r u c t i o n s : d a t a f a r these s u b j e c t s was

d i s c a r d e d a l t h o u g h they uera testad t o a v o i d a n y p r o b l e m s w i t h

the i r peers.

Upon c o a p l e t i o n of the- s u b j e c t s were i n f o r s a l l y \ 7.

quizzed c o n c e r n i n g any rehearsal s t r a t e g i e s w h i c h t h e y m i g h t have

d e v e l o p e d . Subjects were as$ed: n ~ o " , d i d -you try t o reme~ber t h e

Page 56

movements w h i l e you vere wai t ing t c repeat them?". Iha f e u

subjects u h o were u n a b l e to r e s p o n d vere further prompted with

t h e q u e s t i o n : n D i d f o u remember how f a r ycu moved c r w h e r g you

~ o v e d to?*. R e s p c n s € s > were recorded on the subject's d a t a s h e e t s .

C,, 3 e s u l t s

I

Bask d e s c r i p t i v e - statistics f o r each of t h e f a c t o r s t e s t e d

a t each aqe group are given i n Tables 13 (absolute error), l b e

( c o n s t a n t error), and 1c (variable error]. C e l l means a n d

standard deviations from the a n a l y s i s of va r i ance p r o v i d e d i n

Taples Id ( abso lu te error), le (constant e r r o r ) , a n d If ( v a r i a b l e a

e r ro r ) .

The m a i n effects o f age; ~ovenent length, r e t e n t i o n i n t e r v a l

length, and available movement cdes were a l l s t a t i s t i c a l l y

s i g n i f i c a n t for all t h r e e dependent errar measuqea ( ~ d b l e l g ) . >

In addition, the following i n t e r a c t i o n effects were s t a t i s t i c a l l y

s i g ~ i f icant ( T a b l e 1 h) :

2 * 1 . movement l e n g t h b y age for a l l degaedent error neasures m

vfth error f n c r e a s i q as towetent l e n g t h *=creased '7

2 , retention i n t e r v a l length by , age for a 1 1 d e p e n d e n t error

aeasures with error incr~asing a s r e t e n t i o n interval l e n g t h

i n c r e a s e d \

5

Page 57

Page 58

\ DESCRIPTIVE STATISTICS AND ABIA~,YSIS OF VABI BBCE DATA b

POR EXPERIRBBT 1

Page 59

~ab' le .la: D e s c r i p t i v e stati 'st ics of absolute error (Expt 1)

GRADE 6 GBADB 3 h

KI-.DER MOVBMEBT LEB[;TH X SD X SD. X SD

0 SEC 3 - 0 4 1.26 3,85 l m 2 7 4 - 2 0 l m 1 9 . . 15 SEC 3,39 1.30 4 . 1 5 Q 1 ~ 2 6 . 5 . 1 1 1,25

BOVBEEUT CUBS

Page 60

--s

Table Ib: Descriptive statistics of constant error (Expt I)

GRADE 6 GRADE 3 K I N D E R HOVBI!IBET LENGTH X SD X SD X SD

15 SBC -0.35 0.77 -0.15 0.78 ' 0.42 0.61

30 SEC -2.28 1.19 -2.16 1.06 -1.45 1.05

QOVEUENT CUBS

Page 61

T a b l e Ic: ~ e s c r i p t i v e statistics of variable error CExpt 1 ) .

GRADE 6 GRADE 3 KISDEB c LIOVEHI$llT

LEIGTfi X SD X SD X SD

10 Cff \ 1.93 0.38 1.93 0.29 2.43 0.18

RETEETION INTERVAL

0 SBC 1.74 0.41 1.97 0.3'8 2.19 0.40-

t 5 SEC

30 SBC

HOVEHElT CUES

Page 62

T a b l e Id: D e s c r i p t i v e statist ic's of dell\ means f o r - a n a l y s i s of variance of a b s o l u t e error ( E r p t 1)

CELL G R A D E 6 - X SD

G R A D E 3 K I N D E R

Bote: L l = l O . cm, L2=20 cm, L3=40 cm Tl=Osec, T2=15 sec, T3=30 sec C1= D + I., C2= L ALONE

Page 63

8 Table le: D e s c r i p t i v e s t a t i s t i c s of cell means for

a n a l y s i s of variance of constant error (Expt 1 )

CELL GRADE 6 GRADE 3 KINDER

L l T l C l L 2 T I C 1 L3T 1C1 L 1 T 1 C 2 L 2 T 1 C 2 L 3 T l C 2 LbT2C1 L 2 T 2 C 1 ~ 3 ~ 2 ~ 1 ~ 1 F 2 C 2 L2T 2 C 2 L 3 T 2 C 2 L 1 T 3 C I L 2 T 3 C 1 L 3 T 3 C 1 L 1 T 3 C 2 L 2 T 3 C 2 L 3 T 3 C 2

Hots: L 1 - 1 0 cm, L2=20 cm, L3=4O cm T l = O s e c , T 2 = 1 5 sec, T3=30 sec C1= D + L, C2= L ALONE

Page 64

Table If: Descriptive statistics of cell means for analysis of variance of variable error (gxpt 1)

CELL G R A D E 6. GBADE. 3 KINDER

Note: L1=10 cm, L2=20 cm, L3=40 cm Tl=Osec, 12-15 sec, T3=30 sec C1= D + L, C2= L ALOHE -

/'

Page 65

Table lg: Analysis of variance table for absolute error (Expt I)

SOH OF HEAR SOU RCE SQUARES DF SQUARE F P

MEAN 3 1027.4 1 31027.6 1238.95 < O e O I A 604.9 2 302.4 12.08 <0 .01

I ERROR 2178.8 87 25.0

L L X A E R R O R

T T x A ERROR

L x T L x T x A ERROR

C C x A *

ERROR

L x C L x C x A E R R O R

, T x C T x C x A ERROR

L x T x C 23.3 4 5.8 32.70 < O e O 1 LxTxCXA . 8.8 , - 8 1.1 60 16 <O.O1 ERROR 62.0 340 0 • 2

Rote: A=age, L=movement length, T=retention interval, C=cues

Page 66

Table 1h: Analysis of *ariance table for constant error (Expt 1)

sun OF S O U R C E SQUARES

L 1800.6 t X A . 6 * 8 ERROR 40,6

H E A N DP S Q U A R E

1 428.7 2 73 . 4

87 6 0

E x T L x T x A E R R O R

I

C C x A E R R O R

L X C L X C X A E R R O R

T x C T X C X A ERROR

a \

L x T x C 639.9 4 159.2, 4727.86' t0.01 LxTxCXA 0.6 8 0.1 2.35 0.02 ERROR 11.9- 348 0 . 0 3

' 6

Note: A=age, L=movement length,, retention interval, C=cues

Page 67

t

Table li: A n a l y s i s of variance t a b l e for variable error (Expt 1)

SUH OF M E A N SOURCE SQUARES D F SQUARE P P

HEAN 7622.2 1 7622*2 2380.56 <Om01 A 83.6 2 .&la8 12.54 <0*01 ERROR 290.0 87 3* 3

L L X A ERROR

T T x A ERROR

L X T L x T x ERROR

L x C O e 7 L X C X A O e 1 E R R 0 3 . 3 . 1

T x C 3 . 5 T X C X A 0.2 ERROR 3 . 8

L X T X C 0 . 5 , 4 0, 4 26.17 <O*O1 L x T x C x A 0 5 8 0 06 3.94 C.0 .SO 1 ,

ERROR 5 .2 3U0 0 . 0 2

Note: A=age, movement length,' rete ten ti& interval, cues

Page 68

i. Movement Leagth

Collapsed ovsr all conditions of age, r e t e n t i o n i n t e r v a l ,

an3 arailsble movsmant c u e s , tbera is a statistically s i g n i f i c a n t

differeace due to m v a a e n t length for all t h r e e dependent er ror

measures. These r a s u l t s are p a r t r a y e d g r a p h i c a l l y in f i g u r e s 4a

(absolute e r r o r ) , 4 b ( c o n s t a n t errsr) , snd 4c (variable error),

i n which t h e mean 3ependent measoras f o i a11 ages together a r e

p l o t t a d a g a i n s t maranent length, I n a d d i t i o n , t h e d e p e n d e n t error

measures f ~ r ench i n d i v i d u a l age g m u p a r e s i q u l t s n o o u s l p

p l o t t e d .

A p o s t e r i c r r i a n a l y s i s reveals t h a t t h e e f f ec t of aoreaent

l e n g t h is n a t u n i f o r m o v e r the t h ree age g r o u p s . No s i g n i f i c a n t

d i f f e r e n c z s be tween 10 and 20 cr m o v e r e n t s were seen a t any age.

Bowever, w h i l e g r a d e 6 subjects s h o v e d no l e n g t h ef iect a t a l l ,

g r a d e 3 subjects p r o d u z e d g r e a t e r err3rs a t 40 cm than a t

10 =r a n d k i n d e r g a r t e n sabjsc ts shows3 differences between 00

cm movements and b ~ t h 10 a n d 20 cm ones.

I f a b s o l u t e e r r o r is t a k e n a's an i n d i c a t i o n of the a c c u r a c y

o f t h e c r i t e r i o n navement r e p r o d u c t i o n i n d e p e n d e n t of t h e

d i r e c t i o n of the error, t h e r e s u l t s i n d i c a t e that c h i l d r e n o f p a l l

Page 69

ages testsd r e p r o d u c e d shorter movements a re a c c u r a t e l y t h a n d l o n g e r ones in terns of a b s o l u t e v a l u e s . T h i s re-sult can b2

i n t e r p r e t e d i n o n e of two ways. F i r s t , f rom a developmental point -

of V ~ P W , t h e r e s u l t s - a g r e e with a proxiaal-distal t h e o r y ' of

m 3 v e e n t c o n t r o l a c q u i s i t i o n b y c h i l d r e n ( ~ r a t t y , 1967) . ~f

c h i l d r e n l e a r n t o perform s k i l l s p r o x i m a l to t h e midline of tha

body n o r % sasily than those which are more d i s t a l , i t would be

expected t h a t s h o r t e r movements which b e g i n and e n d close to the

midline would be r e p r o d u c s d more a c s u r a t e l y t h a n f onger onas

which take a t l e a s t the aovement - e n d p o i n t f a r t h l r away from t h e

m i d l i n e . The a b s o l u t e e r r o r results show t h i s t* b e so. Second,

from a n i n f o r m a t i o n p r o c e s s i n g p o i n t o f v i a v , i t could be argued S

' t h a t a l o n g e r movement c o n t a i n s nore i n f o r n a ' t i o n than a shortPr

one, i n a n a n a l o g y to F i t t s Law ( F i t t s , 1954) , and i s more

s u s c e p t i b l e t o t i n o i s e " ( t h a t is , e r ro r ) d u r i n g r e p r o d u c t i o n .

T h i s app roach is more useful i n e x p l a i n i n g t h e age

difference vhich is apparent upon o b s e r v a t i o n of the errors for

each movement l e n g t h f o r each age group. If, a s the l i t e r a t u r e

i l l u s t r a t e s i s so f o r v i s u a l a n d v e r b a l tasks, t h s a b i l i t y to

p r o c e s s p r o p r i o c e p t i v e i n f o r n a t i o n i n c r e a s e s uith age, a b s o l u t e

zrror at e a c h movement l e n g t h s h o u l d decrease a s a g e i n c r e V a s e s .

T h i s o c c u r s since the i n f o r m a t i o n c o n t e n t of a g i v e n m o v e a l n t

l a n g t h decreases a s a f r a c t i o n o f t h e t o t a l c a p a c i t y of ths

subject a s c h i l d r e n grow o l d e r . Aga in , the a b s o l u t e e r ro r data -.

show t h i s t o b e the c a s e .

Page 70

t t l t : i4BS0LUTE ERROR VS. HOVB8EI'P LEBG'PH 4B: COPSTAIT ERROR VS. HOVEMEIT LEHGTB 4C: VARIABLE ERROR VS. ROVEIIEIIT LEBlGTH

Page 71

Figure 4 a

o Mean . 5

Kindergarten m Grade 3 A Grade 6/7

-. Movement - Length (cm )

Page 72

Figure 4b . &-

~ M e a n ,

Kindergarten Grade 3

A Grade 6/7

Movement Length ( cm )

Page 73

Figure 4c

0 Mean - Kindergarten Grade 3

A Grade 6/7

Movement Length ( cm )

Page 74

From a p r o c e d u r a l s t a n d p o i n t , o n e a n o m a l y c a n b e i n t r o d u c e d

i n t o t h e r e s u l t s i f care i s n o t t a k e n by t h e experimenter t o

properly define t h s a p p r o x i m a t e endpoints of t h e l o n g e s t

mqvements. If t h e endpoint i s l o c a t e d such t h a t it is a t t h e

l i m i t of t h e mcvement r a n g e of t h e -subject (this i s p a r ' t i c u l a r l y J

i m p o r t a n t fo r y o u n g e r , s m a l l e r subjects), t h e s u b j e c t w i l l

r e p r o d u c e t h e movement extrersely a c c u r a t e l y n o m a t t e r w h a t t h e

l e n g t h of t h e r e t e n t i o n i n t e r v a l . Presn~ably this o c c u r s s i n c e

the s u b j a c t must s i a p l y remember t o move a s far a s is p h y s i c a l l y

p o s s i b l e , a rehearsa l s - t r a t e g y w i t h a n e a s i l y r eaember -ed v e r b a l

l a b e l . The p e r f o r m a n c e i s t h e n q u i t e i n d e p e n d e n t o f a t t e n d i n g t o

p r o p r i o c e p t i v e cues which are s u p p o s e d l y b e i n g tested.

I n t e r e s t i n g l y , when s u b j e c t s were i n f o r m a l l y asked, "DO y o u

t h i n k i t i s easier t o remember t h e s h o r t ones or t h e l o n g onesan,

58 of 90 s u b j e c t s s a i d t h a t longer m o v a k e n t s *ere Bere e a s i l y

remembered w h i l e 26 s a i d t h a t shorter o n e s were easier t o

r e p r o d u c e . The r e m a i n i n g 6 expressed no p r e f e r e n c e . C l e a r l y , t h e

subjects* p e r c e p t i o n s cf t h e i r p e r f o r m a n c e s were c o n t r a r y t o

their ,actual p e r f o r m a n c e s .

T h e d a t a f o r c o n s t a n t e r r o r , which c a n be i n t e r p r e t e d a s an

i n d i c a t i o n of t h e d i r e c t i o n of t h e e r ro r a r o u n d t h e c r i t e r i o n ,

shovs t h a t a s movement length i n c r e a s e s , c o n s t a n t e r ro r becomes

Page 75

m o r e n e q a t i v s . T h i s is, a t l e a s t i n p a r t , i n a g r e e m e n t wit6 t h e

central t e n d e n c y effeOt d r s c r i b e d by Ste lmach (1970) arncn'cj

o t h e r s , The relatively l o n g 40 ca . movements were s u b s t a n t i a l l y

u n d e r s h o t u p o n r e p r o d u c t i o n , a f i n d i n g w h i c h is i n k e e p i n g w i t h

t h e central t e n d e n c y concept. T h e 20 cm, a o v e m e n t s were a l s o d

u n d e r s h o t by a l l age g r o u p s , however, a f i n d i n g no t e x p e c t e d i n

view of t h e f a c t t h a t 20 cm. m o v e m e n t s are closer i n l e n g t h t o

t h e short 10 c a m m o v e m e n t s which for the mean of a l l ages.were

o v e r s h o t a s predicted by c e n t r a l tendency ,theory. N e v e r t h e l e s s ,

t h e 20 cm..movements d i d o c c u p y a n intermediate p o s i t i o n between 4

10crn. and 40 en. while, with a d u l t s , one might n o t e x p e c t a

Ld movement a s short a s 20 cm, t o be u n d e r s h o t , fcr c h i l d r e n , a 20

cm. movement may w e 1 be a long cne a n d , t h e r e f o r e , s u b j e c t t o 1

b-- *- -a' . ~ v e r s ~ o o t i n g , *

A f u r t h e r mitigating f a c t o r i s t h a t e v e n the 10 cm.

movements were u n d e r s h o t b y t h e kindergarten a n d g r a d e 3

subjects. T h e r e a p p e a r s then, to be a t e n d e n c y to tcward 1

u n d e r e s t i m a t i n g a l l n c v e m e n t l e n g t h s a t t h e y o u n g e r a g e s , a

tendency which gradua l ly d i s a p p e a r s as c h i l d r e n take on the more /' 4

adult-like strategies presumably e v i d e n t i n t h e G r a d e 617

subjects.

Page 76

v a r i a b l e e rcor can b e t h o u g h t of a s t h e v a r i a b i l i t y a r o u n d a

c r i t e r i o n wh ich i s s u b j e c t d e f i n e d r a t h e r t h a n a r o u n d the i m p o s e d

c r i t e r i o n d e f i n e d d u r i n g the l e a r n i n g t r i a l . I t was t h e @

e x p e r i m e n t e r ' s i m p r e s s i o n a s t e s t i n g p r o c e e d e d t h a t t h e f o u r

attempts s u p p o s e d l y b e i n g made a t r e p r o t l u c i n g t h e l e a rned

c r i t e r i o n movement were n o t b e i n g made b y t h e s u b j e c t s with t h a t

i d e a i n aind. It was f e l t t h a t t h e f irst ~ o v e m e n t was a

l eg i t imate a t t e m p t t o r e ~ r o d u c e t h e c r i t e r i o n : houever , the

r ema in ing t h r e e Mere n o t a t t e m p t s t o r e p r o d u c e t h e criterion b u t

r a t h e r were a t t e m p t s t o r e c r e a t e t h e f i rs t r e p r o d u c t i c n t r i a l .

The changes i n v a r i a b l e error w i t h mcvement l e n g t h are

r e l a t i v e l y s m a l l a l t h o u g h t h e o v e r a l l e f fect i s s t a t i s t i c a l l y

significant. This s u g g e s t s t h a t s u b j e c t s map be q u i t e c a p a b l e of

r e d u c i n g their e r r o r a r c u n d a c r i t e r i o n l e n g t h o r Iccation,

r e g a r d l e s s of t h e length i n v o l v e d p r o v i d e d t h e y a r e a l l o u e d t o

choose t h e i r own c r i t e r i o n , There i s e v i d e n c e g a t h e r e d w i t h a d u l t

s u b j e c t s t h a t when s u b j e c t s a r e a l l o w e d t o preselect t h e i r own

c r i t e r i o n movement l e n g t h , a b s c l u t e error is less than t h a t of

m o v e a e 6 t s u h i c h a r e of a c o n s t r a i n e d l e n g t h (Kelso a n d S t e lmac ,h ,

1 9 7 6 ) . This was a t t r i b u t e d t o the a b i l i t y a f f o r d e d the h i g h e r

p r o c e s s i n g c e n t r e s to prepare f o r i n c o m i n g p r o p r i o c e p t i v e

f e e d b a c k d u r i n g p r e s e l e c t e d movements , a c a p a c i t y not a v a i l a b l e

d u r i n g u n c e r t a i n , c o n s t r a i n e d r o v e n e n t s (Jones, 1974) . The

s u b s e q u e n t l y a c q u i r e d motor trace i n t h e preselected c o , n d i t i o n

Page 77

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Page 78

FIGURE 5 : THE EFFECT OF RETEITIOI INTERVAL LERGTB OI ERROR HEASORBS

5A: ABSOLUTE ERROR VS RETE WTION INTERVAL LEEGTB 5B: COHSTAIT ERROR BS, B E T E I T I O l I U T E R V I L LBHGTR 5C: VARIABLE ERROR VS* RETEaTION IRTERVAL LBSGTH

Page 79

Figure 5a

0 Mean Kindergar ten Grade 3

A Grade W7

Retention Interval ( sec )

Page 80

67 i

I < Figure 5b J ..=A '

0 Mean Kindergar ten

- m Grade 3 A Grade 6/7

Retention Interval ( sec )

Page 81

0 Mean : Kindergar ten Grade 3

A Grade ' 6/7

. Retention Interval (sec)

Page 82

,

F i g u r e 5a r e s e m b l e s c l o s e l y t h e pattern of t r a a e ' d e c a y s e e n with

a d u l t s r e c a l l i n g v e r b a l m a t e r i a l i n a s h o r t term memory pa rad igm

( P e t e r s o n a n d P e t e r s o n , 1959 ) . U n f o r t u n a t e l y , t h e trace' d e c a y

t h e o r y h a s nevar been f u l l y tasted w i t h c h i l d r e n a s s u b j e c t s .

N e v e r t h e l e s s , S m o t h e r g i l l (1 973) a n d H a i t h (197 1) among o t h e r s

h a v e p r o v i d e d me e v i d e n c e t h a t v i s u a l i n f o r m a t i o n decays d u r i n g f 7 %

s h o r t t e 9 m o r p tasks p e r f o r m e d by c h i l d r e n .

T h e absolute error resul ts of the p r e s e n t ' s t u d y s u g g e s t t h a t Y

c h i l d r e n i n the m b t o r domain d e m o n s t r a t e f o r g e t t i n g d u r i n g an

u n f i l l e d r e t e n t i o n i n t e r v a l . It i s t e m p t i n g tovvieu t h i s a s

d e c a y of ans h p p o t h e s i z ' e d memory trace: however , t h e f i n d i n g s o f

Sroufe ( 1971 ) t h a t c h i l d r e n m a i n t a i n a less s t a b l e s t a t e of

a t t e n t i o n d u r i n g s h o r t term memory t a s k s c o m p l i c a t e s matters.

; T h e pcurer r a ~ r o d u c t i o n s o f c r i t e r i o n movements a t 30 s e c o n d s

r e l a t i v e t o 0 a n d 15 s e c o n d s may be , a t l eas t i n p a r t ,

a t t r i b u t a b l e t o a l o s s cf a t t e n t i o n t o , t h e t a s k wh ich occurs over

time, p a r t i c u l a r l y w i t h t h e y o u n g e s t c h i l d r e n . S i n c e no measure

of a t t e n t i o n was made d u r i n g this s t u d y , (a point which can be

made a b o u t v i r t u a l l y all short term memory s t u d i e s ) , t h e r e s u l t s L

a r s s u p p o r t i v e but not ~ r c o f of t race itecai. Th-is p c l n t couxd be

c i r c u s r e n t e d by t r e a t i n g attentiaa and trace decay as trcl si&es

of the same c c i n r a t h e r t h a n a s two d i f f e r e n t c o m p o n e n t s of motor b -

p e r f o r m a n c e .

Page 83

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Page 84

a, v a r i a b l e error data can ~ o s t e a s i l y be i n t e r p r e t e d a s a n i n c r e a s e .

i n t h e u n c e r t a i n t y of t h e subjects i n r e p r o d u c i n g acverents

following l o n g e r r e t e n t i o n i n t e r v a l s , S t i l l , t h e increase i a

v a r i a b l e error with r e t e n t i o n i n t e r v a l coald a l s o be i n t e r p r e t e d .

a s b e i n g the result of d e c r e a s e d a t t e n t i o n being p a i d t o t h e t a s k

after longer retention i n t e r v a l s . I f t h i s uas so, tbe h y ~ c t h e s i s -

regarding the subjects' s t r a t e g y d u r i n g the r e p e a t e d measures

would not necessarily be d i s c o u n t e d .

iii, A v a i l a b l e E o v f n e n t Cues -

1 P

S u b j e c t s yx" e a f f o r d e d t h e o p p o r t u n i t y t o r e p r o d u c e l e a r n e d ; * /

movements w i t h either r c v e h e n t e x t e n t a n d e n d p o i n t information - - *

a v a i l a b l e , o r w i t h e n d p c i n t inf o r a a t i o n alone. T h e l i t e r a t u r e

ts t h a t l o c a t i o n i s a r e h e a r s a b l e cue not a s subject t o

trace decay a s the ncn-rehearsable extent i n f o r m a t i c n , though t h e

true cha rac t e r i s t i c s of these t w o c u e s a r e not fully u n d e r s t o o d .

T h e da ta in t h i s study show that, collapsed over a l l c o n d i t i o n s

I of age, aovement* l e n g t h , a n d retention interval l e n g t h , there i s +

a s t a t i s t i c a l l y s i g n i f i c a n t difference between t h e t u o roveineat

cue s i t u a t i o n s f o r a l l t h e d e p e n d e n t e r ror aeasures. The results -- - -- - - - - - - - - - - - - --- -- - - - -

are portrayed g r a p h i c a l l y in ~ i g n r e s 6a (absolute e r r c r ) , 6b - - - - - - - - - -

( c o n s t a n t error) , a n d 6c (variable error) .

Page 85

F I G U R E 6 : THE EFFECT OF L#)YEl¶EIT CUES 01 E R R O R a ~ a ~ n a x q

6A: ABSOLUTE B ~ B O B VS. HOVELIEIIT CUBS 6 8 : CbHSTAFtP IfElROB VS, MOVEMEET CUES- 6C: VARIABLE EBROB VS, HOVERERS' CUES

Page 86

73

- Figure 6a

0 Mean a Kindergar ten

Grade 3 A Grade 6/7

txstame & tocation w o r r Alone

Page 87

74

Figure 6b

0 Mean Kindergarten Grade 3 ,

A ,Grade 6 0

Available Movement Cueb

Page 88

Figure 6c

0 Meani.-- ~ ind&~ar ten Grade 3

A Grade W7

/

d Available Movement Cu6

Page 89

~ h i l e t h e results f o r the d e p e n d a n t measures ray b e

; t a t i s t i c i l l y s i q n i f i c a n t , s x a m i n a t i ? n of t h e means r e v e a l s v e r y

l i t t l e d i f f e r e n c e b e t w e e n the two c o n a i t i o n s , A p o s t e r i o r i

a n a l y s i s r evea l s ao significant d i f f e r e n c e , B s v e r t h e l e s s , t h e fr

a i f f e r a n c a for a b s o l n t b e r r a r i s c o n s i s t e n t though s m a l l for a l l

age q r o u p s v i t h the d i s t a n c e p l u s l o c a t i o n group producing

s1f; lht lp less u n s i g n e d error t h a n t h e g r o u p h a v i n g o n l y location . inf o r n a t i o n . T h i s i m p l i e s t h a t , w h i l e t h e c o n t r i b u t i o n t o recal l

~ a d e by d i s t s n c e inforsation is s m a l l , i t does a n h a n c a t h e

i This f i n d i n g i s i n t e r e s t i n g i n view of t h e s u b j e c t s g

C?

p e r c e p t i . o n s of the i r tssk performsace, When a s k e d a b o u t what c u e s

sere a t t e n d e d t o d a r i n g t h e r e t e n t i o n i n t e r v a l , o n l y 6 of 30

subjzcts made any r e f e r e n c e t o d i s t a n ~ e ( f o r e x a n p l e ,

I; rememberel bow far I m,vedn) even when d i n t l n c e was a reliable

cue. R o s t subjects uera location o r i e n t e d in their approach,

p e c c e t v i n g t h e i r s t r a t e g i e s i n such ways a s just renenbered

w h e r e it ( t h e s t o p ) wasm.

C o n s t a n t error ags in shored a s u r p r i s i n g r e s u l t , indicating

t h a t morerents mad2 with l o c a t i o ~ in£ormation a l o n e t ended t o be

nnitersbot r e l a t i v e t o moveaen'ts made with b o t h distance and- *

l o z i t i o n informati~n t 3 g e t h ~ r . T h i s r e s u l t h a s n o t b e e n reported L

with a d a l t s and t h r r e * a p p & r s t o be n3 theoretical base t o

e x p l a i n i t .

Page 90

The d i f f e r e n c e i n v a r i a b l e e r r o r is shown t o be

s t a t i s t i c a l l y significant. Houeve r , e r a m i n a t i o n of t h e maans

r evea l s v e r y l i t t b e d i f f e r e n c e be tween t h e twc c o n d i t i o n s

a l t h o u g h t h e d i f f e r e n c e i s c o n s i s t e n t f o r all age groups. If

there is more usefal movement i n f o r m a t i o n a v a i l a b l e when subjects C - a r e g i v e n both distance and l o c a t i o n , then it might be e q s c t e d

t h a t t h e i r respcnses would be less v a r i a b l e a b o u t t h e i r cwn I

4

s e l f - d e f i n e d c r i t e r i a movement. Uhile s t a t i s t i c a l l y t h i s

a p p e a r s t o b e t h e case, i n p r a c t i c a l terms there i s little t o

choose i n * , v a r i a k l e errot be tween t h e t w o c o n d i t i o n s ,

iq. I n t e r a c t i o n Ef iects *-

T h e r e a r e numerous interaction effects which c a n be

considered given the. d a t a i n T a b l e s I f , 9, and b . ZYcst i m p o r t a n t

p c i n t s of d i s c u s s i o n c a n b e made b y referring t o t h e two way

i n t e r a c t i o n s seen w i t h a b s o l u t e error a s the d q e n d e n t measure.

The other d e p e n d e n t errcr m e a s u r e s show a ' s imi lar pattern t o t h a t

of a b s o l u t e error a n d little a d d i t i o n a l i n f o r m a t i o n to

t h a t discussed i n t h e m a i n effects s e c t i o n s of this c h a p t e r or L that t o f o l l o w c c n c e r n i n g t w o - way i n t e r a c t i o n s f o x a b s o l u t e

error. The s i g n i f i c a n t three-way i n t e r a c t i o n s f o r a t s o l u t e error

' will a l s o be briefly d i s c u s s e d .

Page 91

P e r h l p s more Lnterestf ng t h a n t h o s e two-way i n t e r a c t i o n s

w h i c h are s t a t i s t i z a l l y significant are t h e t u o which are n o t ,

a l t h o u g h null results s h o u l d be c a u t i o u s l y considered.

First, i n t e r a c t i o n 3f a r a i l a b l e movement cnes with age is

n o t s i g n i f i c a n t . This r e s u l t , which is best seen i n t h e p a r a l l e l

nature of t h e l i n e s fo r the three age groti$s in F i g u r e Sa, dhows

t h a t the effect d e s c r i b e d i n s e c t i o n iii of t h i s c h a p t e r i s t h e

same 3t all a g e s . No age e f f e c t i n t h e a p p a r e n t s u p e r i o r i t y of

I d i s t a n c e p l u s l o c a t i o n o v e r l o c a t i o n a l o n e is s e e n . C h i l d r e n a t

a l l ages t e s t e d d e m o n s t r a t e s l i g h t l y less e r r o r w i t h b o t h cues-

p r e s e n t s u g g e s t i n g that the way i n which p r o p r i o c e p t i v e cues a r e

u s e 3 is.fixed'bp t h e age of f i v e and i s no t a l t e r e d b y the a g e of . , \

t w e l v e . It is in teres t ing t o note, however, t h a t f o r adults, the

superiority of distance p l u s location over l o c a t i o n a l o n e is .

dif f icolt t o d e m o n s t r a t e .

\ Second, t h e i n t e r a c t i o n of movement l e n g t h with ~OVement CU8

is a l s o n 3 t significant, meaning that p c o p r i o c e p t i v e p e r c e p t i o n . ----$--

~f a v a i l a b l e c u e s is the same i n d e p e n d e n t o f t h e movement b e i n g

performed. ~ h k s is not s u r p r i s i n g given $hat t h e d i f f e r e n t

r o ~ e m e n t s tested4ia t h i s study were of t h e same class, differing . on ly* i n l e n g t h and not in t h a method o f pe r fo rmance . r'

Alth3agh t h e i n t e r a c t i o n of moverent cnes w i t h age uas not - .

s i g n i f i c a n t , t h e interactions of miemah l e n g t h and r e t e n t i o n "6

i n t a r r a l l e n g t h with age are both * $ t k a t i o t i c a l l p s i g n i f i c a n t . The ,

Page 92

>

f o r m e r can be s e e n i n P i q u r e 4a, the l a t t e r in Figure Sa. I n

b o t h cases, the lines f o r t h e three age g r o u p s d e p a r t from

parallel, g r a p h i c a l l y s h o v i n g t h e i n t e r a c t i o n , I n t h e c a s e o f the

movement length b y age i n t e r a c t i o n , the two y o u n g e r g r o u p s show a

s i m i l a r r e s p o n s e t o roverent length, I t is t h e o l d e s t g r o u p which

diverges from t h e p a t t e r n of t h e o t h e r two, d i s p l a y i n g no effect

of aoveaent l e n g t h o n a k s a l u t c srror b e t w e e n 10 cm. and 20 c m .

movements. The i n c r e a s e i n a b s o l u t e error a t 40 cm, seen i n the

two y o u n g e s t g r o u p s is e v i d e n t i n t h e o l d e s t g r o u p a s ue l l ,

h o v e r e r . This i n d i c a t e s that a t t h e l o n g - e r movement l en 'g ths , t h e

effect vhich was in some uay buffered by t h e o l d e s t g r o u p a t

s h o r t e r lengths o c c u r s , e

I n the c a s e of t h e r e t e n t i o n i n t e r v a l by age i n t e r a c t i o n , it <

i s the youngest g r o u p w h i c h departs f rom t h e p a t t e r n of t h e o t h e r

two. rhe a b s o l u t e error f o r t h e . y o u a g e s t subjects increases

n a r k e d l y f o r ths 30 second r e t e n t i o n i n t e r v a l w h i l e t h e i n c r e a s e

for the two oldest g r o u p s is approximately l i n e a r with t h e

increase s e e n between 0 and 15 seconds. Ycunger children are

c l e a r l y more a f f e c t e d b y long retention intervals t h a n clder

children, 1h fact, t h i s disparity right- -expressed b~ e y i n g '-3. *

t h a t a_ s h o r t retention i n t e r v a l f o r an o l d e r chQld n i g h t *ell be

one f o r a y o u n g e r c h i l d . Y

Page 93

Two o t h e r two-way i n t e r a c t i o n s a r e s t a t i s t i c a l l y

s i g n i f i c a n t . I h e s e are the l e n g t h by retention i n t e r v a l and t h e

r e t e n t i o n interval by a v a i l a b l e movement c u e s i n t e r a c t i o n s

p o r t r a y e d g r a p h i c a l l y i n Figures 7a and 7 b r e s p e c t i v e l y . The

fcrmer e f f e c t is the r e s u l t of t h e d e v i a t i c n of the 30 second

gronp of movements s h o r i n g a greater i nc rease i n error w i t h

mo,vement l e n g t h than t h e r a te o f i n c r e a s e seen b e t w e e n t h e too

shorter r e t e n t i c n i n t e r v a l s . T h i s implies t h a t t h e l c n g e r the

r e t e n t i o n i n t e r v a l , the more difficult i t b e c o e e s to r e p r o d u c e

t h o s s movements which arg most dif f i c n l t t c p e r f o r m . R e l a t i v e l y

speaking, t h e movements made a t t h e s h o r t e r r e t e n t i o n i n t e r v a l s

are less susceptible t o t b s a o v e a e n t l e n g t h effect,

T h e r e m a i n i n g s i g n i f i c a n t two-way i n t e r a c t i o n to be

discussed h e r e is t h a t cf r e t e n t i o n i n t e r v a l by a v a i l a b l e

m v e m e n t cues. T h i s results from two b a s i c a l l y d i f f e r e n t s h a p e d

c u r v e s , o n e f o r d i s t a n c e plus l o c a t i o n , t h e c t h e r f c r l o c a t i o n

a l o n e ( F i g u r e 7b). The curve for d i s t a n c e p l u s l o c a t i o n a p p e a r s a

t o p l a t e a u a s t h e r e t e n t i o n i n t e r v a l i n c r e a s e s u h i l e t h e l o c a t i o n

a l o n e curve a p p e a r s t o accelerate as r e t e n t i o n i n t e r v a l

increases, This s u g g e s - t s t h a t the graater amount of -2

p r o p r i o c e p t i v e i n f o r m a t i o n - a v a i l a b l e i n ' t h e d i s t a n c e ~ l u s

l o c a t i o n c c n d i t i o n is of v a l u e a't t h e l o n g e r , r e t e n t i o n

. i n t e r v a l s . I t migh t be s p e c u l a t e d t h a t i f even l o n g e r r e t e n t i o n

Page 94

FIGURE 7: I I T E R A C T I O I EFFECTS FROB ANaLYSIS OF V A R I A H C E II EXPERIBEBT 1

7 A : mVElfE )IT LE116TE BY RETEUTIOE IIITERVAL I IITERACTIOI 7B: B e T E I T I O I I I T E R V A L BY ROVEHEIT CUE IBTEBACTIOB

Page 95

v o sec Q 15. set 030 seg

Page 96

Retention Interval (set)

Page 97

* - 434 - - -

1 b- -

- d - - * -

i n t e r v a l s were ~sea, location a l o n e might become inapepaate d r e

q n i c k l y t h a n t h e dista%ce p l u s l o c a t i o n c o n d i t i o n , i n d i c a t i n g a

*bnf f e r i n g * effect of some k ind of i n c r e a s e d sensor? iof ormation

on task difficulty,

Two sf gnif f c a n t thr& wa y i n t e r a c t i o n s w i t h ahsolate atfox

and one f oar- wa y i n t e r a c t i o n invo lv i . ng age o c c u r r e d (Tab18 tg) . These were the movement length by r e t e n t i o n i n t e r v a l by age,

=atent ion mohment cue by age, and t h e aorement /J

l e n g t h by r e t e n t r/ on i n t e r v a l b y movement c u e by age i n t e r a c t i o n s .

B o t h of t h e three-wa J i n t e r a c t i o n s were exaninecl g r a p h i c a l l y P

and the nature of t h e interactions s n b j e c t i r e l y i n t e r p r e t e d ,

T h e s e complex interaction effects were deemed n o t t o c o n t r i b u t e ,/- L s u b s t a z l t i a l l y to t h e di ~ t t s s i o ~ of - t3ere lopren ta& t r e a d s and t h e i r '. - - \

\ a n a l y s i s i s not inc lnded here . ',

I t should be n o t e d t h a t t h e rek'ul ts of E x p e r i 8 e n t I r e l a t i n g

to sotor l e a r n i n g theory mast be viewed w i t h c a u t i o n , For ------ practical readns , a l l subjects performed 18 movements. s h i l e

"

i n statistical t e r n s this was handled by t h e use of repeated

measures statistical technigms, i n hoaan t e r m s , ' t h e b u i l d u p - -

'C - - - - - - - - - - - -

of proactive intarf erance (discaosed in Chapter 3) may have r-, - - - - - - - -

had s6ae effect which is i n c a l c u l a b l e , Bowever, it is ao4, %ST, - 9

u n r e a s ~ n a b l e t o suggest t h a t t b h effect'-;itigated against G

finding s i g n i f i c a n c e and t o propose c a u t i o n $s n o t to s u g g e s t

a l a c k of coaf ibnce i n the f i n d i n g s . ..

pd

Page 98

CBAPTEB 3

Experiment 2

A. I n t reduction

P r o a c t i v e interference can b e regarded a s a buildup of

activity p r i o r to learning a specific task which i n h i b i t s r e c a l l

by c r e a t i n g a background of prior e x p e r i e n c e aga inst which i t is

d i f f i c u l t t o p i c k o u t t h e d e s i r e d r e s p o n s e during r e c a l l . Much

a t t e n t i o n h a s been g i v e n to i n t e r f e r e n c e effects a n d motor s h o r t

t e r ~ memory i n an attempt to evaluate the r e l a t i v e c o n t r i b u t i o n s a

o f t r a c e decay and i n t e r f e r e n c e t o f o r g e t t i n g .

B e l a t i r e l y more research i n motor s k i l l s h a s been d e v o t e d t o

proact ive i n t e r f e r e n c e effects than r e t r o a c t i v e i n t e r f e r e n c e

ones, (an interesting s t a t e . o f . affairs when o n e c o n s i d e r s 'that, *

%. . i n v e r b a l l earn ing , p r o a c t i v e interference effects ci retention. 7

are of lesser magnitude than those of r e t r o a c t i v e i n t e r f e r e n c e

(Postaan, 196 1) . Since p r o a c t i v e i n t e r ' f e r e n c s was e a s i l y

generated in verkal I e < r n i n g studXes, it was strange to dlscover

durfng ear ly attempt-s t o transfer p r o a c t i v e interference s tua ie s .c

from $he verbal t o t h e motor domain t h a t there was no

demonstrable effect i n single t r i a l designs. Such a f a i l u r e was i

no doubt f r u s t r a t i n g f r c o the aspect of parsimony i n t h a t i t b

Page 99

'argned a g a i n s t t h e existence of a common b e h a v i o u r a l law u h i c h ~W

encompassed both v e r b a l and motor l e a r n i n g , Among the s t u d i e s

r e p o r t i n g negative r e s u l t s fo r p r o a c t i v e i n t e r f e r e n c e i n m t o r

s h o r t term 8emorg were l lontagne and B i l l i x (1960) . and H i c k s a n d

Cohn ( 1975) . However, same evidence f o r p r o a c t i v e i n t e r f e r e n c e 4

i n m o t o r t a s k s was reported by Ascoli and Schmidt (1969) and

v i l l i a a s 11971) who r epo r t ed t h a t c r i t e r i o n movement r e c a l l uas e

j i n d i r e c t l y a f u n c t i o n ' of t h e Bumber of p r e v i o n s ~ o v e ~ e n t , t . I n s

1974, Burwitz discussed these i n c o n s i s t e n t r e s u l t s of motor

proactive i n t e r f e r e n c e e x p e r i m e n t s i n terms o f t h e c o g n i t i v e

c o n t r o l of motor b e h a v i o u r , r e f e r ~ i n g s p e c i f i c a l l y t o t h e i d e a of

d i r e c t e d f o r g e t t i n g .

B .*

w h i l e i n single t r i a l s d e s i g n s i n t .he motor 'domain p r o a c t i v e

interference i s not p roduced , it c a n b+ d e m o n s t r a t e d i n a r e v e r s e

o r d e r or. m u l t i p l e t r i a l d e s i g n ( ~ s c b l i a n d S c h m i d t , 1969) . I n

s u c h a design, subjects l e a r n a series of moveaents, t h e l a s t of

which is t h e c r i t e r i o n movaaent , then recall them i n reverse "

o r d e r . T h i s p r e v e n t s t h e first sovements of t h e series fzom b e i n g ?

d i s c a r d e d ( d i r e c t e d t o r g e t t i n g ) s i n c e , o n l i k & the subjects i n a

single trials d e s z g n , s u b f e ~ 3 s m u s t recall all aovellerits i n t h e

s e r i e s . B u r v i t z showsd that, in a rrr1tip;fe trf als i3esiga, '

p r o a c t i v e - i n t e r f e r e n c e c o u l d b e - e l i m i n a t e d by i n s t r u c t i n g

subjects t o i g n o r e t h e first four movements of a f i ' v e rovement

series. Thus i t was i l l u s t r a t e d t h a t s u c c e s s o r f a i l u r e t o n

Page 100

g e n e r a t e p r o a c t i v e i n t e r f e r e n c e i n motor s h o r t term aemory

e x p e r i m e n t s was dependent upon p r o c e d n r a l d i f f e r e n c e s ,

s p e c i f i c a l l y whether or n o t s u b j e c t s ceuid p u r p o s e f u l l y f o r g e t

r a t er ia l deemed t o be t a s k - i r r e l e v a n t , Such e x p e r i m e n t a l , re s a l t s r - '.

are consistent with t h o s e t h e o r e t i c a l l y summarized b y ~urvitz ( 1974

who emphasized the impor t ance of directed forgetting as a hasic t

p r o c e s s i n avoiding a p o t e n t i a l l y d e b i l a t a t i n g b u i l d u p o f . p r o a c t i v e interference i n everyday s i t u a t i o n s . However, i t is "

- worthwhi le to note t h a t , l i k e v e r b a l l e a r n i n g , the amount of

p r o a c t i v e i n t e r f e r e n c e g e n e r a t e d i n motor l e a r n i n g s t u d i e s i s t

st ill l e s s than the amount of r e t r o a c t i v e interference ( P e p p e r

and Berman, 197 I) ,

&nother aspect of p r o a c t i v e i n t e r f e r e n c e i;.rorthy of

d i s c u s s i o n here, ' t h a t being an i n c o n s i s t ' e n c y betveen the verbal

i and motor domains. E v e n t a k i n g i n t o a c c o u n t directed f o r g e t t i n g ,

> k it is stil l p o s s i b l e t o g e n e r a t e p r o a c t i v e i n t e r f e r e n c e i n a 3

Z

s i h g l s t r i a l d e s i g n f o r movements, b u t p o s s i b l e i n s i n g l e t r i a l

v e r b a l d e s i g n s . Barvitz a t t r i b u t e d this n o t to d i f i e r e d t

mechanisms o f l e a r n i n b a n d performance b u t to procedural

differences between experiments. In the motor domain, r e sponsas - - -

are measured on a cont inuous scale while i n v e r b a l s t u d i e s I

responses a r e b i n a r y , that is, either right or wrong, remembered C

o r f o r g o t t e n , with no way of kndwing the degree t o which t h e

Page 101

nonsense s y l l a b l e s are remembered, A c c e p t i n g this e x p l a n a t i o n , we

can view t h e memory mechanisms rn verbal and motor s k i l l s t o b e

basically the same. I n f a c t , i n v e r b a l l e a r n i n g , it i s p o s s i b l e .'*

t o show responses on a continuous scale if CCC s y l l a b l e s a r e u s e d

in place of the more common CVC s y l l a b l e s , By m e a s u r i n g t h e

au=b%r of 1ettar-s resea-Cered correctLy, results c a n be brought

into l i n e w i t h those reported i n motor l e a r n i n g (Jnnq, 1972) .

B . Exper imenta l Design And flethods

1 . a l l error measures are not s i g n i f i c a n t l y different for

the directed forgetting p r o a c t i v e - i n t e r f e r e n c e d e s i g n r e l a t i v e to

c o n t r o l s : ha weoer, a l l error aeasures i n c r e a s e r e l a t i v e t o t h e

other twc groups f o ~ ' the no directed f a r g e t t i n g " p a r a d i g m , Such

f i n d i n g s would b e taken a s s u p p o r t fbr t h e i d e a t h a t , within each

age group, c o g n i t i v e c o n t r o l of motor b e h a v i o u r exists i n the

form of d i r e c t e d f o r g e t t i n g , I n a d d i t i o n , an i n c r e a s i n g effect of . =

directed f o r g e t t i n g w i t h i n c r e a s i n g age is hypothesized bs the . . *

result of increased c o g n i t i v e control. - -

Page 102

ii. S u b j e c t s

The same s u b j e c t s who performed tasks i n Exper iment I uere

t e s t e d i n Experiment 2 after ~ x p e r i m e n t 1 was c o m p l e t e d , a

iii. Apparatus -4' L

The apparatus was t h e sass a s t h a t used i n Exper iment 1 .

iv,Design and A n a l y s i s

Experiment t 2 was desSgned t o i n v e s t i g a t e p r o a c t i v e

i n t e r f e r e n c e . Thirty subjects from each age g r o u p performed under

3 c o e d i t i s n s , t h e o r d e r of which was randoaly a s s i g n e d . The f i r s t - c o n d i t i o n was a c o n t r o l , i n which a movement of l e n g t h 20 cm.

\r

was repeated f o l l o w i n g a 30 s e c o n d nnf i l l e d r e t e n t i o n interval. e

In t h e o t h e r two designs, t h r e e interfering movements o f l e n g t h s

15, 2 5 , and 3 5 cm. were u s e d t o genera te proactive i n t e r f e r e n c e .

I n ths f i r s t of t h e two, snbjects p e r f o r m e d , t h e n r e c a l l e d 30 \

s e c o n d s later each of the 3 i n t e r f e r i n g movements and t h e

c r i t e r i o n movement, The criterion movement was always l a s t i n t h e C

seqnencb; t h e interfe movements were p r e s e n t e d i n random

o r d e r . This d e s i g n nay r e p r e s e n t e d i n t h e f o l l o u i n g way:

Page 103

where n represents a l e a r n i n g t r i a l and B ' a r e ~ r o d n c t i o n

t r i a l , !l4 was t h e 20 cm criterion movemant.

In the second of t h e two interference d e s i g n s , t h e subject

p e r f o r m e d a l l four movements o n e after another, w i t h t h e a

* c r i t e r i o n movea~nt being fourth i n the sequence and t h e

i n t e r f o r i n q mcremohts preceding it i n raohcm order. All four

movements were reproduced i n reverse o r d e r beginning 30 seconds

afte; t h e l e a r n i n g t r i a l of t h e criterion ibrement. The des ign

nay be represented i n t h s f o l l o w i n g way:

- - - - - -- - -- - -

1

Four a t tempts a t each criterion movement r e c a l l ~ e r e given.

The design tested b y s t a t i s t i c a l analysis was a 3dages) x - 3 ( c o n d i t i o n s . of p r o a c t i v e ' i n t e r f e r e n c e ) d e s i g n with ~ e p e a t e d

measures o n the s e c o n d factor.

Page 104

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Page 105

%when t h e experimenter was s a t i s f i e d t h a t t h e subject f u l l y

comprehended what was required, t h e experiment proceeded a s

o u t l i n e d i n t ' h e instructions.

C, Resul t s

Basic descriptive s t a t i s t i c s f o r each o f t h e three

c o n d i t i o n s a t each age group are g iven in T a b l e s 2a ( a b s o l u t e ,

error), 2 b ( c o n s t a n t error), a& 2c { v a r i a b l e error). The main

, effect of t h e proactive interference paradigm was s t a t i s t i c a , l l y

significant for a b s o l u t g error and c o n s t a n t error, hut not f o r

v a r i a b l e e r r o r . I n addition, t h e i n t e r a c t i o n effect betreen the L

paradigms and age was statistically s i g n i f i c a n t for a . b s o l n t e

error and c o n s t a n t e r r o r . but not f o r v a r i a b l e error (Table 2d).

B

Page 106

m ThBLES 2A,B,CID.

DESCELIPPIVE ST~FISJFECS &ED ~ W ~ L I S X S OF VBRIARCE DATA FOR1 EXPEPIUEBT 2

Page 107

E a

T a b l e 2a: Descript ive statistics of absolute error (Bxpk 2)

EXPERIBE@TAL KI JDEB C O S D I T I O I -

X SD

CORTBOL

DIB ECTED POBGETTIEG 5 * 3 8 2.29

80 DI R ECT ED PORGETTIIG 7,58 2 ,61

GRADE 3 GRADE 6

Page 108

T a b l e 2b: D e s c r i p t i v e e a t i s t i c s of constant error (Expt 2)

CBADE 3 . G R A D E 6

10 DIRECTED POBGETTIUG 0.66 8.10 -3,44 '3.11 -3.44 4..28

Page 109

9 * ' . , , -7 4

able* 2c: Descripkire statistics .of r a r i e l a error ;13tpt 2) . I

f ' ' , - . B

fl EXPE~ILIE'RTAI KII~QEB. GRADE 3 s R A D E 6 -

C O B D I T I O I ' 0 , . - - -

. .X SD X ' S D q 9 c - . .('I[. e , SO' ?, < ~ . . . . c

.. . C " * - ' ' ' ' ~ - - -

DIR ECTED PORGETTIHG

2

RO DI 3 ECT ED

-PORGETTIHG

Page 110

Table 26: a n a l y s i s of variance, ' - table (Expt 2 )

1

SOU OF MEAM'. SOU RCE SQUARZS . =kp SQU . . AR'E p .

A b s ~ T ~ t e 2. Error

* . ,

. ~o.n"st&nt. Error

LlEal 1277,5 A6 E 14.3 PI DESf6S 0.6 & x DEStE ' 3.97 ERROR 659.0

Page 111

As c h i l d r e n age, t h e i r a b i l i t y t o d i s r e g a r d t a s k - i r r e l e v a n t

i n f o r m a t i o n i n c r e a s e s (Ragen, 1367; D r u k e r and Hagen, 1969) . The

three p r o a c t i v e i n t e r f e r e n c e designs essentially r e g r e s e n t t h r e e

i n f o r m a t i o n . ~ h & control c o n d i t i o n r e p r e s e n t s a sit n a t i o n in

w h i c h c n l y r e l e v a n t i n f c r m a t i o n is p s e s e n t , in p a r t i c u l a r , t h e L

s p e c i f i c movement b e i n g tested. The d i r e c t e d f o r q e t t i n g p a r a d i g n , 0

on t h e other hand , represents a s i t u a t i o n i'n which the s p e c i f i c

task-relevant f n f o r n a t i o n is p r s c e d e d by i r r e l e v a n t i n f o r n a t i o n

i n t h e form o f three i n t e r f e r i n g movemsnt r , The s u b j e c t i s % I

p r o v i d e d with the o p p o r t u n i t y t o i g n o r e that i n f c G m a t i o n by t h e

process of d i r e c t e d forgetting, h o & r e r , I n t h e no di~ectcd Z

-. f o r q e t t i n g paradigm, t h e specific p e r f c r m a n c e task is a g a i n

1 p r e c e d e d b y o t h e r i n f o r r a t i o n . I n t h i s case, all the i n f o r m a t i e h $ -'

\

i s p e r c e i v e d by t h e subject as b e i n g r e l e v a n t and nct subject t o

directed f o r g e t t i n g , Performance on t h e d i r e c t e d f o r g e t t i n g t a s k

relative t o t h e c o n t r o l i s thus a tes; of the subject*^ a b l i t y t o

disregard t a s k - i r r e l e v a n t inforaation, Per formance i n t h e no

d i r e c t e d f o g g e t t i n g p a g a d i g ~ -relatee t o t h e - - c o n t r c l -- i s \ i n d i c a t i v e of t h e central ptocessing c a p a c i t y of the s u b j e c t ,

lover r e p r o d o c t i o n enots i s l p l y i n q a g r e a t e r a b i l i t y to r e t a i n @ '

B

Page 112

Om

y

cn .c,

0)

D

A

a,. lc,

Tl

C)

m

Page 113

d

F I G U R E 8: THE EFFECT OF PROACTIVE IITEBPEREBCE ON ERROR REASURES

8 A : ABSOLUTE ERROR VS,. PI D E S I G I 8B: CQISTMT BflRQR LVS, PI D B S I G I

Page 114

Figure - 8a

Kindergar ten Grade 3

A Grade W7

-Control Dkected Fkw@tw No Directed ~orgettik

Experimental Condition

Page 115

Kindergar ten Grade 3

A Grade ,@'

Control Directed Forgbtting Mo 1 % Directed Forgetting

Experimental m i t i o n

Page 116

w h i c h are undershot w h i l k ' t h e multiple t r i a l s design produces a n %

even greater u n d e r s h o o t i n g of t h e criterion, The ycungest

subjects depar t from the pattern on t h e t w o o l d e r group*, i n L t h a t

. movements made i n t h e m u l t i p l e trials d e s i g n were o v e r s h o t L.

r e l a t i v e t o b o t h the c o n t r o l and t h e c r i t e r i o n itself. These

r e s p o n s e s a r e u n e x p e c t e d since two of t h e t h r e e i n t e r f e r i n g w moveasnts were l o n g e r t h a n - t h e c r i t e r i o n a n d m i g h t ~ e a s o n a b l p be

. *L

, e x p e c t e d t o . . e l i c i t an adapta t ion r e s p o n s e i n the d i r e c t i o n of t h e ,

overall i n t e r f e r e n c e , Such a ' rssponse would produce p o s i t i v e , b 6

n o t n e g a t i v e , c o n s t a n t e r r o r . It ~ o u l d b e speculated t h a t

subjects r e s p o n d e d t o r e l a t i v e l y l o n g i n t e r f e r i n g movements b y C

a v e r c o m p e n s a t i n g and, therefore, u n d e r s h o o t i n g , T h i s suggestion

gives subjects c r e d i t for a h i g h e r degree cf c o g n i t i v e control of.

motor b e h a v i o u r t h a n the a b s o l H e error data on directed

forgetting i n d i c a t e . however , A t t h e p r e s e n t time, t h i s f i n d i n g a

is i n e x p l i c a b l e g i v e n present t h e o r i e s of adaptat icn level

r e s p o n s e s (IIelson, 1 9 6 4 ) ,

L"..

No statistically s i g n i f i c a n t effect of t h e proactive

i n t e r f e r e n c e ~ a r a d i g a s on v a r i a b l e error w%s d e m o n s t r a t e d L

although the age effect, as p r e v i o u s l y d i b c u s s e d , was

s i g n i f i cae t , O l d e r c h i l d r e n shoved c o n s i s t e n t l y less v a r i a b l e

e r r o r i n a l l c o n d i t i o n s t han y o u n g e r ones, The p a r a d i g m s by a g e

i n t e r a c t i o n effect u a s n o t significant s h o u i n g t h a t p r o a c t i v e

i n t e r f e r e n c e affects c h i l d r e n i n t h e same way a% all a g e s tested, G

B

Page 117

4 CHAPTER 4

- ~ - . .. . -

z+: . . J

\ - Experiment 3 %&' *~ -. . . -: -

\ - A. I n t r o d u c t i o n ..

C

Jenkins a n d , D a l l e n b a c h ~ ( 1 9 2 4 ) found that s u b j e c t s showed I

d i f f e r e n t . a m o u n t s of r e t e n t i o n of v e r b a l ~ a t e r i a l f o l l o r i n g sleep a

\ '

t h a n f o l l o ' w i n g r a k i n g activity. S u b j e c t s d i g p l a y e d decreases in

r e t e n t i o g d u r i n 2 the f i r s t two h o u r s a f t e r l e a r n i n g anber -both

c o n d i i i o n s f bough the sleeping s u b j e c t s showed marginally less .

f a rge t ting , w.rver, b e t w e e n two a n d e i g h t h o u r s p o s t learning + r

t h e raking u h l i k e tbe s l e e p i n g g r o u p , c o n t i n u e d t h e l o s s

*f material evanYthougb th8 a c t i v i t i e s i n which t h e y sere

: i n v o l v e d were u n r e l a t e d t o t h e test nonsense s y l l a b l e s . T h e s e '

4. ' ,

r e s u l t s l *d t q t h e s u & e s t i o n t h a t general a c t i v i t y s p e e d s t h e - f

l o s s of n e w l y acquired skills. T h i s i n t e r f e r e n c e c o n c e p t , aaong

F o t h e r s , uas a b r e a k w i t h tra t i o n a l thought which h e l d ,

\ ,

f o r g e t t i n g t o be a f u n c t i o n of the decay o f t h e B e a o r y t r a c e ( -

a c q u i r e d d u r i n g l e a r n i n g . I t was i n c l u d e d in a summary of t h e .

basic p r i n c i p l e s of r e t r p a c t i v e i n t e r f e r e n c e (oi r e a c t i v e ,

\ B

inhibition in R u l l i a n terms) p u b l i s h e d by HcGeoch a n d Iricn

f

Among t h e f a c t o r s t h o u g h t t o a f f ec t the i n t e r f e r i n g

q u a l i t i e s of i n t e r p o l a t e d a c t i v i t i e s were:

Page 118

-

.o

1. The degree of s i n i l a r i t y b e t w e e n original a n d

i n t e r p o l a t e d activities a s e l a b o r a t e d i n t h e Skaggs -Rob inson

h y p o t h e s i s ( R o b i n s o n , 1927) and t h e Osgood t r a n s f e r s u r f ace a n d

its m o d i f i c a t i o n s (Osgood, 1946; l a r t i n , 1965). I n t e r g o l a t e d

t a s k s of s l i g h t s i m i l a r i t y t o t h e o r i g i n a l h a v e the g r e a t e s t

- i n t e r f e r i n g effect .

\ 2. The level of , o r i g i n a l learning, t h a d is, i n t e r f e r i n g

t

. effects are r e d u c e d under c o n d i t i o n s of high o r i g i n a l l e a r n i n g *

', ( K r e n g e r , 1929) .

i

3 . The amoudt of i a t e r p o & a t e d m a t e r i a l a n d t h e degree' t o

which it is l e a r n e d , t h a t is, t h e g r e a t e r the a m o u n t and l e a r n i n g

of i n t e r p o l a t e d m a t e r i a l , t h e greater t h e l o s s of o z i g i n a l 1

mater ia l (Underwood, 1954) . 8

,

\ Even before Adaas and D i j k s t r a (1966) B u g g e s t e d t h a t more

a t t e n t i o n be p a i a t o the results of i n t e r f e r e n c e o n motor < s k i l l s

r e t e n t i o n , 6

a n d had d o n e exac tl'g t h a t .

- Their subjects were p r e - t r a i n e d by, guidance i n a l e v e r i3

' p o s i t i o n i n g task and t h e n instructed t o nova u n g u i d e d t o t6e test

target. During a 28 secend retention i n t e z v a l , one of t u o '-/ i s t e ~ p o f a t e d tas& was introduced: s u b j e c t s either re-hroed t h e

lever or picked a pencil up from t h e f l o o r . R e - z e r o i n g i n d u c e d

Page 119

n o r e t r o a c t i v e i n t e r f e r e n c e while, picking u p t h e pencil d i d h a v e \

a s i g n i f i c a n t i n t e r f e r i n g effect. A d d i t i o n a l d e a % n s t r a t i o n s of B

' retroactive i n t e r f e r e n c e i n m o t o r t a s k s h a v e been r e p c r t e d b y -. I ~ e r i a n and B a i l e y (1970) and P e p p e r and Herman ( 1 970). Taken. I. . _

t o g e t h e r , 'their r e s u l t s i n d i c a t e t h a t , f o r force r e s p o n s e s , h

retroacti~v~~interference is an import n t c a u s e of f o r g e t t i n g : i n Y f a c t , t h e l a t t e r p a p e r f a i l e d t o p r o d d m any e v i d e n c e f o r t h e . trace d e c a y h y p o t h e s i s f u r recal l i n t e r v a l s b e t w e e n 4 a n d 60

1

s e c o n d s t h o u g h t h e a u t h o r s d o e x p r e s s t h e i r s u p p o r t f o r a d u a l t

p r o c e s s t h e o r y of f o r g e t t i n g i n motor s h o r t term memory.

I n t e r p o l a t e d force r e s p o n s e s g r e a t e r t h a n t h e c r i t e r i o n were, r

' u n i f c r n l p s u c c e s s f u l i n p r o d u c i n g ' r e t r o a c t i v e i n t e r f e r e n c e , w h i l e f- '7

i n t e r p o l a t e d forces less than t h e c r i t e r i o n g e n e r a t e d less

i n t e r f e r e n c e , T h e d i r e c t i o n of the i n d u c e d e r r o x increase was i n

the d i r e c t i o n of t h e i n t e r p o l a t e d movement, s u p p o r t i n g a n - b

P

. a d a p t a t i o n l e v e l response a s d i s c u s s e d b y H e l s o n ( 1 964) and

~ i c k i 6 s o n 11 976) . d

29,- 1

- "& " ' R e c e n t s t u d i e s of i n t e r f e r e n c e h a v e c o n c e n t r a t e d n o t si~ply

on o b s e r v i n q the effect of i n t e r f e r i n g movements on t h e = 7

r e p r o d u c t i o n of a criterion b u t rather h a v e a t t e m p t e d t o u s e

interference as a t o o l t o g a i n - i n s i g h t i n t o the c h a r a c t e r i s t i c s

of the codes which subserve movement i n f o r m a t i o n . Kerr (1973) 8

p r o p o s e d that i n t e r f e r e n c e is of- two k i n d s . C a p a c i t y interference 4

o c c u r s when t a s k s demand more o f t h e l i m i t e d c e n t r a l p r o c e s s i n g

Page 120

-. c a p a c i t y than i s a v a i l a b l e ; structural i n t e r f e r e n c e o c c u r s ~ h & n <

-

t a s k s compete for t h e s.aa.0 p s r c e p t i v e and merorg p r o c e s s e s . Both

~ i e w e r t 6 1 976) a'nd Laabs (1974) hare reported t h a t d i f f e r e p t

k i n d s f movement i n f o r m a t i o n ( f o r example, direc t i cn v s .

a m p l i t u d e or d i s t a n c e v s . l o c a t i o n ) a r e i n t e r f e r e d w i t h \

' d i f f e r e n t l y . Bt t h e p r e s e n t t i a e , however, s u c h studies a r e . p r e l i m i n a r y " and little i s Known o f the ways i n which lsoveaent

i n f o r m a t i o n , i s ccded ,

B, Experimental Design and Methods

a

i . H y p o t h e s e s

3

1.. n l l error measures i n c r e a s e i n subjects p e r f c r m i n 9 under

c o n d i t i o n s o f r e t r o a c t i v e j n t e r f e r e n c e relative to c a n t r o l +

s u b j e c t s . Sych a f i n d i n g ~ o u l d b e .taken a s s u p p o r t f o r a role of

retroactive l a t e r f s q e n c s i n s h o r t term motor f o r g e t t i n g .

2 . A 1 1 e r r o r measures a r e less under b o t h c o n d i t i o n s of

i n t e r f e r e n c e and c o n t r o l w.hen a h i g h e r l e v e l of o r i g i n a l l e a r n i n g

i s q i v e n . Such a f i n d i n g would be taken a s support for t h e

r e s i s t a n c e t o r e t r o a c t i v e i n t e r f e r e n c e afforded ,by increased

original l e a r n i n g . '$"

Page 121

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Page 123

The i n s t r u c t i o n s specific t o Experiment 1 rere r e p e a t e d t o

t h e s u b j e c t s a t this time. he' only change was thag tbosa

subjects who were to be g i v e n ten original l e a r n i n g trial's were

t o l d that $hey would r e c e i v e t e n , not one, l e a r n i n g t r i a l s .

s perf arming the r e t r o a c t i v e interference parq.digm -_ r e q u i r e d t h e s e a d d i t i o n a l i n s t r u c t i o n s :

-\ A f t & goo hare done y o u r learning t r i a l t s ) , there r i l l hC h

wait ing p e r i o d beiore I a s k you to repeat your .learned movement.

During t h a t time I w i l l ask ybu t o make three d i f f e r e n t

movements to the stop. one right, after a n o t h e r . Phen you have B

done these three. I w i l l ask you to r e p e a t t h e movement you 0

.-.I ' l e a r n e d befote t h e waiting p e r i o d . " i

When t h e experimenter was s a t i s f i e d t h a t the subject f u l l y \

comprehended what was required, t h e expeAaent p r o c e e d e d a s

o u t l i n e d i n t h e i n s t r u c t i o n s .

B 1

C; R e s u l t s

B a s i c descriptive statistics for t h e c o n t r o l and t h s Q

i n t e r f e r e n c e ccmditians a t each age groiip a tg 9Tven 35 ~ a b l < 3a.

Basic &escriMire st&istics for t$e conditions of b i g 3 and law

o r i g i n a l igarning are a l s o g i v e n in Table 3a. The main effect of

Page 124

P ' .a.

-.

-

, retroactive interference w a ~ ~ s t a t i s t i c a l l y \ -

a b s o l u t e error; bat not for constant er ror

- - - -- - -

s i g n i f i c a n t for * . . f - L L - -

.or variable exror

(Table 3b). . *. The ,interaction ei-fect of retroactitv-e interference

and age was not statistically s i g n i f i c a + n t for any of t h e three P

dependent r r o q measures (Table 3b). For both control and

. interference ' the -effect b f c r i g i n a l learning was ' . * 'i

statistically significant for a l l o f t h e dependent err& meaqores d -

( T a b l e 3c) .

Page 125

TABLES 3 A , B , C , D a

FOB EXPEBIMEET 3-.

Page 126

Table 3a: mcriptire S t a U sties Of Retx,pa~t~* Xa tcerfhramze ~ x p e r i m e n t (Expt . 3)

( *

KIIDERGABTEB G R A D E 3 G R A D E 6/7

I I T E R - PEREBCE

Page 127

Table ib: Dsscript ire Stat ist ics Experiment (Expt 3 )

I BIGH O B f 6 I U A L L E A B I I I G

, SD

For O r i g i n a l Learning ,

LOR O B I G I I A L LEARUIIG, *

Page 128

T a b l e 3c: . ,

SOURCE '

A b s o l u t e Error

C o n s t a n t Error

HEAH AG E RI DESIGR A x DES9N ERROR

Yar iable Error

3EAN AG E RI D E S I G N A x DES91 EB R OR

A n a l y s i s of Variance Table F o f Retroactf ve ~ i p e r i a e n t (~xpt.

sun OF ~ E A B SQUARES DP SQUARE PW

Interference

Page 129

Table 3d: Ana lys i s of variance Table For Original earning Experiment (Expt. 3)

S-tlH OF MEAN SOURCE - SQUARES DF S Q U A R E F P

CONTROL

CE REAH 140. 1 1 140.1 5.07 0.03 E R R O R 2406.0 88 27.7

Y E EIEAN 117.2 1 117.2 95.80 <O.O1 E R R O R ' 106.4 88 1 . 2 ~

IHTER- )

FEREHCE

AE H E A N . 4164.5 1 4165.5 1.04 0.38 ERROR 8516.9 88 96.8

CE H E A N %

680 . 4 . 140.1 5 * 1 0 0.03 ERROR 11739.3 88 133.4

a

V E n E a l 184.5 . I i8rr.s 58.8 <O.OI ERROR 276.0 88 3 . 1 .

Page 130

* D, Discussion

_ - The ability to produce decrements i n recall of learned

mater ia l b y introducing int%rpolated a c t i v i t y i n t o t h e r e t e n t i o n

i n t e r v a l has a long h i s t o r y i n both t h e verbal and motor domains.

Given that children do n o t a t tend t o s h o r t term memory tasks as

well as a d u l t s (Sroufe, 1971) , children would be expected to

r e a d i l y denonstrate retroactive interference effects, The

a b s o l u t e error data show t h a t , collapsed o v e r a l l ages , t h i s is

the c a s e . Orilp the grade 3 subjects show no s t a t i s t i c a l l y %

,3+

s i g n i f i c a n t different effect of t h e retroactive i n t e r f e r e n c e

paradigm, possibly due to the extremely large variance about the

mean d e a o n s t r a t e d b y the grade 3 s u b j e c t s during t h e . i n t e r f e r e n c e

task. The results, t a k e n w i t h the previously r e p o r t e d trace decay

r e s u l t s , offer support for a d u a l process f o r g e t t i n g mechanism i n t

t h e age groups t e s t e d i n t h e Rotor domain. w h i l e the i n t e r a c t i o n

effect between interference and age was gnat significant, t h u s

s e t t i n g it apart from t h e trace decay d a t a , s i m i l a r -results {that

is, younger children showing greater trace decay t h a n older &es

a s the r e t e n t i o n interval l e n g t h e n e d ) might have been obtained i f

d i f f eren t lewels of retroactive interference had been .produced by

different amounts of i n t e r p o l a t e d a c t i v i t y , Younger c h i l d r e n ,

with less " c e n t r a l processing c a p a c i t y , would d e a o n s % r a t e - 5

Page 131

increasingly greater i n t e r f e r e n c e e f fects a s t h e r e t e n t i o n

interval is i n c r e a s i n g l y filled. -

The data for c o n s t a n t and variable errors show-no

s t a t i s t i c a l l y s i g n i f i c a n t effect of retroactive interference.

He vertheless, whi l e t h e results arb n o t statistically signif f c a n t , the aeans for constant error show t h e s a n e unexpected a d a p t a t i o n

l e v e l response for two of the age groups as was described for t h e

proactive interference d a t a , The interpolated a c t i v i t y , thqngh

g e n e r a l l y of greater magnitude than the criterion moveaent,

produced reproduct ion efforts which uere markedly undershot

relative to controls, A s stated - b e f o r e , there i s n o readily

available explanation for t h i s phenomenon, \ ' ;

Page 132

ii. Original L e a r n i n g d

Adaas and D i j k s t r a (1966) t e s t e d , w i t h a d u l t s , t h 6

h y p o t h e s i s t h a t a more firmly e s t a b l i s h e d memory trace i s more \

, r e s i s t a n t t o t h e i n t e r f e r i n g effects of i n t e r p o l a t e d activity I

t h a n a less well established one . S u b j e c t s were p r o v i d e d w i t h

e i t h e r small, medium, o r large amoun t of o r i g i n a l l e a r n i n g p r i o r

to the f i l l e d r z t a n t i o n i n t e r v a l . S u b j e c t s who had had t h e most '

l e a r n i n g t r i a l s were l ess affected by r e t r o a c t i v e i n t e r f e r e n c e .

T h e d a t a i n this s t u d y indicates t h a t the same effect ,

a p p a r e n t l y does n o t occnr. w i t h c h i l d r e n . For c o n t r o l q r o u p s , t h a t

is, no i n t e r p o l a t e d a c t i v i t y , t h e g r o u p h a v i n g more o r i g i n a l

Learning t r i a l s had a r e d u c t i o n i n a b s o l u t e . e r r o r upon \

r e p r o d u c t i o n of t h e c r i t e r i o n . The i n t e r f e r e n c e g r o u p , o n t h e

other hand, showed exactly t h e . o p p o s i t e e f f e c t t o t p s c o n t r o l s t

a n d t o t h e expected r e s u l t . T h e s e s u b j e c t s who had s u p p o s e d l y

l e a r n e d the task t o q $ i g h e r d e g r e e wers a c t u a l l y laore << -

s u s c e p t i b l e t o the effects of r e t r o a c t i v e i n t e r f e r e n c e a s

i n d i c a t e d by t h e i r s i g n i f i c a n t l y increased a b s o l u t e e r r o r . I n

a d d i t i o n , i n c r e a s e d o r i g i n a l l e a r n i n g h a d l i t t le effect be tween B t -

c o n t r o l and i n t e r f e r s n c e g r o u p s a s shown by the means in T a b l e

3a. For constant error, the o v e f a f l effect of increased or ig ina l

l e a r n i n g . was t o s h i f t r e p r o d u c t i o n r e s p o n s e s i n e x p l i c a b l y i n t h e

Page 133

. ,

negat*ive d i r e c t i o n . O n l y f o r v a r i a b l e error was a p r e d i c t a b l e

effect of i n c r e a s s d o r i g i n a l learning seen. Subjects i n both

c o n t r o l a n d i n t e r f e r e n c e g r o u p s s h o w e d a decrease i n v a r i a b l e

p r ro r when more l s a r n i n g t r i a l s were g i v e n . T h i s i n d i c a t e s t h a t

t h e i n c r e a s e d l e a r n i n g d i d generate a more well e s t a b l i s h e d

memory trace. ~ e v e = t h e l e s s , i n t K e face of i n t s r p o l a t e d ' . a c t i v i t y ,

, o n l y t h e c o n f i d e n c e i n t h e memory trace remained s i n c e what t h e

s u b j e c t s remembered a s being t h e c r i t e r i o n 'was n o t i t a t a l l ,

hence the i n t e r f e r e n c e e f f e c t . P

1 "

d

. Original l e a r n i n g a p p e a r s t o h a v e a n unusual a n d =-.

u n p r e d i c t a b l e e f fec t on children l n t h e contex t of t h e s h o r t term 3

memory paradigm. T h e c a u s e of t h e s e r e s u l t s i s n o t u n d e r s t o o d a t

this time. It i s possible t h a t , by i m b e d d i n g the experiment on

oriqinal learning w i t h i n a l a r g e number of o t h e r e x p e r i m e n t a l

demands upon t h e subject, t h e effect, of p r o a c t i v e interference

inherent i n t h e design confounded the original l e a r n i n g results

p r o d u c i n g t h e u n e x p e c t e d f i n d i n g s . T h e difference between o n e and \<

t e n original l e a r n i n g t r i a l s may well h a v e been t r i v i a l by t h e

t ime Experiment 3 was p e r f o r m e d .

Page 134

CHAPTER 5

General is cuss ion #

T h e r e s u l t s p r e s e n t e d i n this s t u d y have i m p l i c a t 5 o n s i n

b o t h t e a c h i n g of motor and motor l e a r n i n g and p e r f o r m a n c e t h e o r y .

For t h e l a t t e r , t h e p o i n t s t o be made s t a n d o n f i rm g r o u n d s i n c e ,

generally s p e a k i n g , t h e o r e t i c a l a p p r o a c h e s t o m o t o r l e a r n i n g h a v e

been f o r m u l a t e d from t h e simple k i n d s of novetuents such a s t h o s e

usedahere. For the former o n t h e other hand, care s u s t be taken

n o t t b g e n e r a l i z e ' t o aoveaent classes f a r removed from t h e

e x p e r i m e n t a l ones, C o m p l i c a t e d p h y s i c a l e d u c a t i o n s k i l l s a r e

very d i f f e r e n t froa l i n e a r p o s i t i o n i n g a n d g e n e r a l i z a t i o n s s h o u l d

be made only with c a u t i o n . S t i l l , the i i n d i n g s h e r e can be , u s e d .

a s g u i d e l i n e s f o r i n s t r u c t i n g c h i l d r e n i n motor skills p r o v i d e d

that t h e y are recognized a s h a v i n g come froa s i m p l e s k i l l s a n d ,

may require m o d i f i c a t i o n i n order t o b e a p p l i e d i n t h e

"class room" s e t t i n g .

1

C o n s i d e r i n g first ths f i n d i n g s of E x p e r i m e n t 1, s e v e r a l

p o i n t s of i n t e r e s t a r i s e . T h e trace decay cf motcr i a f o r r a t i ' o n

. s e e n with c h i l d r e n d u p l i c a t e s that s e e n i n o t h e r s h o r t term

memory work in both the v e r b a l and motor domains w i t h a d u l t s , For

Page 135

r e t e n t $on i n t e r v a l l e n g t h effects, c h i l d r e n c o n f ~ r a t o

theore t ica l , e x p e c t a t i o n s ;nd d o n o t r e q u i r e s p e c i a l c o n s i d e r a t i o n

w i t h i n the t h e o r e t i c a l framework. Prom a p r a c t i c a l s t a n d p o i n t , i t

is , w o r t h w h i l e n c t i n g t h a t younger c h i l d r e n a r e less s u c c e s s f u l a t

r e t a i n i n g p r o p r i o c e p t i v s i n f o r m a t i o n i n s h o r t term memory a n d

p r e s u m a b l y a t t r a n s f a r r i n g i t t o lonq term memory. T h i s s u g g e s t s *

t h a t i n a s i t u a t i o n i n which g u i d a n c e i s b e i n g p r o v i d e d d u r i n g

s k i l l l e a r n i n g (a s i t u a t i o n a n a l o g o u s t o the c o n s t r a i e e d learning

t r i a l s ) , c h i l d r e n , p a r t i c u l a r l y young ones, s h o u l d he

a attempt t o repeat t h e movement o n the i i : own a s quickly a s

p o s s i b l e a f t e r t h e g u i d e d learning t r i a l . I n this way, the

r e p r o d u c t i o n t r i a l will a p p r o x i m a t e the l e a r n i n g trial a s c l o s e l y

a s p o s s i b l e . I f a l l learning a n d r e p r o d u c t i o n t r i a l c o m b i n a t i o n s

are p e r f o r m e d i n this manner , a model of the s k i l l - a p e r c e p t u a l

t r a c e - (Adams,. 1971) w i l l be acquired with a minimnn of v a r i a n c e

o r noise a s s o c i a t e d w i t h it. Such a trace s t o r e d i n long term*

memory could c o n c e i v a b l y facilitate future p e r f o r m a n e e of that.

p a r t i c u l a r s k i l l d u e t o t h e s m a l l amoun t of u n q e r t a i n t y

a s s o c i a t e d w i t h it.

Uhen d i s c u s s i n g t r a c e d e c a y r e s u l t s f r o 8 E x p e r i m e n t 1, it is

worth n o t i n g t h a t a n i n c o n s i s t e n c y arises when the f i n d i n g s are \

compared with c o n t r o l findings i n E x p e r i m e n t 2. Por all age .groups,L

ths 30 second u n f i l l e d retention interval i n Experiment ? s h o u l d

ma tch w i t h t h e 30 s e c o n d u n f i l l e d r e t e n t i o n i n t e r v a l i n E x p e r i m e n t

2. They d o n o t match, however. There i s c o n s i d e r a b l y nore memory

- l o s s under c o n d i t i o n s i n E x p e r i m e n t 1 than i n E x p e r i m e n t 2. The

Page 136

1

d i f f e r e n c e Bay be e ' x p l a i n e d ' b y t h e f a c t t h a t , i n Experiment- i

'*

1, sob j p c t s pe'rforaed i n a s i t u a t i o n of a c c u m n l a t i n g p r o a c t i v e

i n t e r f e r e - n c e , T h e r e f o r e , the d a t a 9 n E x p e r i m e n t 1 can a t bsst be

o n l y s u g g e s t i v e of tracs d e c a y ; T h e r e s u l t s may be s q u a l l y vell

e x p l a i n e d by t h e a l t e r n a t i v e ~ ~ e c h a n i s d o f p r o a c t i v e i n t e r f e r e n c e .

Despite t h e c o n t r o v e r s y a b o u t +he r e l a t i v e u s e f u l n e s s of -

d i s t a n c e a n d l o c a t i o n information, e v i d e n c e here shows two p o i n t s

c l e a r l y . First, c h i l d r e n use l o c a t i o n - i n f o r m a t i o n a s t h s i r

primary p r o p r i o c e p t i v e i n p u t , a r e s u l t in keeping with what is

known a b o u t a d u l t s . This i s not t o say that d i s t a n c e i n f o r m a t i o n

is not of value. S u b j e c t s a t a l l ages benefitted s l i g h t 1 y f ro@

t h e presence o'f t h e extra d i s t a n c e i n f o r m a t i o n , suggesting that, 2

whenever p o s s i b l e , it is "useful t o a d v i s e c h i l d r e n t o attend * t o -, ,

a l l a v a i l q b l e movement c u e s .and, i f necessary, t o h a l p them

develop s t r a t e g i e s by which t h e y m i g h t better u s e them.

'I C h i l d r e n i n t h i s study, when inf o f m a l l y q u e s t i o n e d a b l u t

t h e i r p e r f o r m a n c e s t r a t e g i e s , i m p l i e d t h a t t h e y were unaware of

u s i n g distance i n f o r m a t i o n i n a n y way. Yet the d a t a show t h a t ,

a l t h o u g h unaware of i t , t h e y were, Also, c h i l d r e n s t a t e d t h a t

l o n g e r movements were easier t o remember t h a n s h o r t o n e s although

the d a t a show t h e opposite t o be true, These r e s u l 4 s , t a k e n

together, indicate t h a t children's p e r c e p t i o n s are n o t t h e b e s t

s a u r c s of i n f o r m a t i o n regarding t h e i r progress a t a given motor

Page 137

task.

\ ' D e l v i n g i n t o t -he effect of movement l e n g t h , t h e d a t a i n this. l

s t u d y s h o w s w i t h i n a b e h a v i o u r a l . f r a m e w o r k what h a s been r e c e n t l y

demonstrated b y a t l e a s t some a u t h o r s i n n e u r o p h ~ s i o l a g i c a l

s t u d i e s , T h e r e is e v i d e n c e ( a i l l a x , 1975; Tracey . 1979) t h a t , ,

d u r i n g ext-enscr m o ~ e m s n t s , j o i n t r e c e p t o r s p r o v i d i n g l o c a t i o n

i n f o r m a t i o n f i r e d i f f e r e n t i a l l y a t d i f f e r e n t p o s i t i e n s . Bs

e x t e n s i o n c o n t i n u e s , t h e l o c a t i o n of t h e l i m b i s leas r e l i a b l y

a o n i t d r e d i n the j o i n t s r e s u l t i n g ( f r o a a b e h a v i c u r a l standpoint)

i n the s u b j e c t h a v i n g less r e l i a b l e locat ioa information for

~ o v e m e n t s r e q u i r i n g g r e a t e r e x t e n s i o n t h a n for n o v e a e n t s

r e q u i r i n q lesser e x t e n s i o n , Whi le t h e a b s o l u t e -error d a t a f o r

movement length bear t h i s o u t i n t h i s p a r t i c u l a r s t u d y ( b o t h for

a b s o l u t e and percent v a l u e s , t h a t is, error e x p e e s s e d as a

of t h e t o t a l l e n g t h ) , the p r o p o s i t i o n i s still t e n t a t i v e .

T h e arm p o s i t i o n i n g task c o n d u c t e d o n s u b j e c t s here is p r i m a r i l y

a s h o u l d e r a n d elbow t a s k a n d t h e r e c e p t o r i n f o r a a t i c h $ o n e s from

studies of the knee, wrist, and e lbow. T h e t r a n s f e r a b i l - & k y of

cbarac teristics of receptors f SOP one j o i n t t o ' a n o t h e r is

u n c e r t a i n (P. Bawa, p e r s o n a l commnnica t i o n ) a n d t h e knowledge i n

t h i s aspect of motor c o n t r o l awaits a combined

behavionral /neurophys io log ica l study,

Page 138

Page 139

Children are easily a f f e c t e d by p r o a c t i v e interference and 1

younger ones have poorly developed cognitive skills like directed

forgetting. To minimize tbese effects, the goa l of t e a c h i n g a

progressive series of skills should be fully e x p l a i n e d so that

the c h i l d fully coaprehends t h a t a l l the s k i l l s are related and

that t h e easy onas st the hegixubq of the sezies axe

t a s k - r e l e v a n t .

With ,reference to r e t r o a c t i v e interference, i t i s c l ear t h a t

c h i l d r e n are dranatically a f f e c t e d b y i n t e r p o l a t e d a c t i v i t i e s .

his c a n be minimized in the practical setting by r e d u c i n g a s

much a s possible the length of the retention i n t e r v a l so a s to

+redgee the o p p o r t m i t g f o ~ i n t e r f e r e n c e t o ocdur. Shile this

makes bath theoretical and practical s e n s e , the data -on level o f '

o r i g i n a l l e a r n i n g p r o d n c e d i n t h i s study c r e a t e s t h e antenable

pedagogical position of h a v i n g to a d v i s e a g a i n s t practice for

fear o f having p e r f o r a a n c e d e g e n e r a t e a l t o g e t h s r , These r e s u l t s

aay be b e s t i n t e r p r e t e d i n t h e c o n t e x t of p r o a c t i v e i n t e r f e r e n c e

c o n f o u n d i n g t h i s part of Exper iment 3,

/-

. The basic prenises of motor skills r e s e a r c h developed with - - - - - - - - - - - -- - - --- - - - --

adults have been related to child growth and d e v e l o p m e n t . - - - - - - - -- - -- -- - - -- - -

Children adhere closely to the performance characteristics of

adults s u g g e s t i n g t h a t t h e laws of n o t o r behar iour are

Page 140

A - parsimonious o v e r t h e three age levels, e x t e n d i n g probably t o

a d u l t h o o d . D i f f e r e n c e s do occur between age g r o u p s i n t h o s e tasks

which require a high degree of cognitive c o n t r o l bver motor

behavioor indicating t h a t some motor p e r f c r a a n c e s may require

more c o g n i t i v e ability than v e r y young c h i l d r e n p o s k e s s .

#everth,eless , t h e bas i c p r i n c i p l e s cf motor learning and

performance hold t r u e for children a s they do for adults.

Page 141

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APPBHDIP 1: A POSTERIORI AIALISIS OF SIGRIPICAIIT H A I H

EFFECTS OF EXPERIBElTS 1, 2, &BD 3

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Appendix 1 presents t h e r e s u l t s of a posteriori a n a l y s i s of

significant s a i n effects described i n t h e t e x t in Tables 1 and 2. JI

Only a b s o l u t e error main effects are c o n s i d e r e d here s i n c e they

are the o n l y ones around which t h e discussion of derelopment has

r e v o l v e d . C a l c u l a t i o n s were done u s i n g the method of S c h e f f e a s '

d e s c r i b e d by Ferguson (1976) . cr i t ica l P v a l u e s were chosen to

test s t a t i s t i c a l s i g n i f i c a n c e a t the 0 . 0 5 level.

The f o l l o w i n g abbreviations are used i n t h i s a p p e n d i x :

GB3 = G R A P E 3

G R 6 = G R A D E 6

1OCB = 10 CEBTIHETEB HOVE8ENTS

20CH = 20 CENTIBETEE f4OVEaENTS

OSEC = 0 S E C O M RETENTION I H T E R V A I

1SSEC = 15 SECOND RETENTION INTERVAL

30SEC = 30 SECOND BETENTIOH ,INTERVAL

COB = CONTROL GBOUP, EXPERIBEHT 2

DP = DIRECTED F O B G E T T I B G , EXPEBIHEBT 2 A

NDF = NO DIRECTED FORGE'PTIBG, EXPEBIHENT 2

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CALC.ULATED P CRITICAL /F 'I

OSEC - 1SSEC 38.62

OSEC - 3 0 S E C 280 .OO

CON - DP 13.32

DP - blDP 2 2 . 5 6

CON - BDP - 7 0 . 5 6 -