Perceiving Form IIObject Recognition

Kimberley Clow

Office Hours: Mon 10am-12pm

kclow2@uwo.ca

http://instruct.uwo.ca/psychology/215a-570

OutlineAttention

Attention Based BlindnessRecognition by ComponentsView-Based Recognition

Neurological PathwaysLearning To SeeFace Perception

Prosopagnosia Greebles

What Do You See?

Different Objects …

Snowflake Lightening bolt

Can Look the Same

Similar Objects …

chairs

coffeepots

sunglasses

Can Look Different

Attention is Important

Object Based AttentionFixation Cue (Prime) Test

• • •

• • •

Valid

• • •

Invalid(same object)

Invalid(different object)

Sequence of events

Inattentional Blindness

Trials 1-3 Inattention Trial Recognition Test

Inattention Paradigm

A Closer Look

Trials 1-3

inattention trial

recognition test

more trials

divided attention trial

more trials

fullattentiontrial

ResultsP

erf

orm

ance

Re

lativ

e to

Ch

anc

e

Attentional Condition

Beyond Attention

1) How can we recognize objects when we can’t see all the parts?

2) How can we distinguish among objects that share common features?

3) How can we recognize group membership of objects that look very different?

4) How can we recognize the same object in multiple orientations?

Recognition by Components

Examples

+ =

+ =

What Do You See?

Read the Words

What Do You See?

View-Based Recognition

Natural Viewpoints

Altered Viewpoints

Evidencecu

mul

ativ

e re

spo

nse

(sp

ike

s)

post-stimulus time (ms)

upright45 degrees off

horizontal

135 degrees offinverted

5000

150

120

90

60

30

0

Human EvidenceLetters

Objects

95% confidence interval around chance level

% c

orre

ct r

espo

nses

Stimulus Orientation

Remember the Neurology

Learning to See

Practice Makes Perfect!

What About Faces?

Prosopagnosia

Greebles