ies 2008: adaptive tutoring seminar building students metacognitive skills through interactions with...

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IES 2008: Adaptive Tutoring seminar Building Students Metacognitive Skills through Interactions with Computer-based Teachable Agents Gautam Biswas [email protected] Dept of EECS & ISIS Vanderbilt University Collaborators: Dan Schwartz, Kefyn Catley Postdoc, Students (at Vanderbilt): Rod Roscoe, John Wagster, Hogyeong Jeong, Nancy Morabito, Jim Segedy, Garrett Linn Supported by Dept. of Education IES, and NSF REESE Awards

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IES 2008: Adaptive Tutoring seminar

Building Students Metacognitive Skills through Interactions with Computer-based

Teachable AgentsGautam Biswas

[email protected]

Dept of EECS & ISISVanderbilt University

Collaborators: Dan Schwartz, Kefyn CatleyPostdoc, Students (at Vanderbilt): Rod Roscoe, John Wagster, Hogyeong

Jeong, Nancy Morabito, Jim Segedy, Garrett Linn

Supported by Dept. of Education IES, and NSF REESE Awards

IES 2008: Adaptive Tutoring seminar2

Goals of our work• Learn Science through principles that apply

across domains• Processes, Entities, Relations, Interdependence, and

Balance

• Preparation for Future Learning• Students should become independent learners, even

when they move away from the computer environment

• Learning for oneself – ability to assess one’s learning progress • Learning is never a one step process

• Cognitive tasks and Metacognitive strategies

IES 2008: Adaptive Tutoring seminar3

Outline of Talk• Our Approach to Learning by Teaching

• Betty’s Brain, a Teachable Agent

• Learning Science by creating Causal Concept Maps

• Assessment through self-other monitoring

• Adaptive Tutoring• Providing Metacognitive support in support of

Preparation for future learning

• Experimental Studies

• Current/Future Work

IES 2008: Adaptive Tutoring seminar4

Betty’s Brain

• Query

• Teach

• Quiz

Additional resourcesAdditional resources

• Mentor AgentMr. Davis

• Text Resources

• Betty can explain her answers

IES 2008: Adaptive Tutoring seminar5

Teachable Agents• Students teach computer agent using visual

representations

• Agent’s performance based on what she is taught

• Students re-teach agent so that they may do better, (and in that process they learn)

• Agents only learn what they are taught explicitly by student

• No machine learning algorithms drive our agent

• Learning through social interactions

• Shared representations

• Shared responsibility

Learning Science• By creating visual concept map structures

• Entities • e.g., fish, macroinvertebrates, dissolved oxygen

• Relations • causal: fish consume macroinvertebrates

• increase decrease effects

• Causal Reasoning• Cause-effect relations extended to chain of events

• Fish waste bacteria nutrients algae

• Interdependence • Multiple dependencies: everything depends on each other

IES 2008: Adaptive Tutoring seminar6

IES 2008: Adaptive Tutoring seminar7

Metacognition to aid Learning

• Metacognition describes two component processes• Ability to monitor one’s cognitive activities

• Ability to take appropriate regulatory steps when problem is detected

• Implemented as Self-regulated learning strategies• Involves multiple aspects when learning

• Setting goals

• Planning

• Seeking help

• Monitoring one’s own learning

• ….

Monitoring when Problem Solving

• Self monitoring (cf. to self explanation) requires two coordinated processes• Ability to generate solution steps

• Analyze and correct for discrepancies

• Our approach: Self-other monitoring while teaching (& learning for oneself)• Provide support to help student’s organize their own

learning• Betty: demonstrates self-regulated learning behaviors by

example

• Mentor: provides additional support and hints

IES 2008: Adaptive Tutoring seminar8

IES 2008: Adaptive Tutoring seminar9

Example regulation strategiesRegulation

Goal

Pattern

DescriptionBetty’s response

MONITORING BY

ASKING QUERIES

Successive quiz requests but no queries asked of Betty in between quizzes

I’m still unsure of this material and I would like to do well. Mr. Davis said “take the quiz only if you think you will do well.”(Betty refuses to take quiz)

MONITORING THROUGH EXPLANATIONS

Multiple requests for Betty to give an answer but no request for explanation

Let’s see, you have asked me a lot of questions, but you have not asked for my explanations lately. Please make me explain my answers so you will know if I really understand.

TRACKING PROGRESS

The most recent quiz score is significantly worse than the previous score

I would really like to do better. Please check the resources, teach me, and make sure I understand by asking me questions that are on the quiz. My explanation will help you find out why I am making mistakes in my answers. Also, be sure to check out the new tips from Mr. Davis.

IES 2008: Adaptive Tutoring seminar10

Example regulation strategies

Regulation

Goal

Pattern

DescriptionMentor’s response

MONITORING THROUGH EXPLANATIONS

Multiple requests for Betty to give an answer but no request for explanation

Without asking Betty to explain her answers, you may not know whether she really understands the chain of events that you have been trying to teach her. Click on the Explain button to see if she explains her answer correctly.

TRACKING PROGRESS

The most recent quiz score is significantly worse than the previous score

Betty did well on the last quiz. What happened this time? Maybe you should try re-reading some of the resources and asking Betty more questions so that you can make sure she understands the material.

SETTING LEARNING GOALS

Betty is asked a question that she cannot answer for the second time

I’ve seen this kind of difficultly with teaching other students in the past. You should look for missing links between concepts or links that are in the wrong direction.

IES 2008: Adaptive Tutoring seminar11

Mentor: other forms of help• On-Demand Help: Students select which kind of helps they need

• Pedagogical examples• “What should I teach Betty?”• “How can I be sure that Betty learns what I have taught?”

• Learning examples• “How do I know that I know enough to teach?”

• Domain-content examples • General – What domain content is relevant, chains of reasoning• Specific: “I need help on the quiz.”

• Help after quiz taken: Adaptive• ICS & LBT systems – where errors have occurred in concept map and

possible fixes• SRL groups – what to read so as to do generate a more correct map

IES 2008: Adaptive Tutoring seminar12

Experimental Studies

IES 2008: Adaptive Tutoring seminar13

Betty’s Brain: Experimental Studies

• Fifth-grade students teach and learn about river ecosystems in several 45-min. sessions, and complete written pre/post tests• Domain: River ecosystems: interdependence and balance involving: (i)

Food Chain, (ii) Photosynthesis and Respiration, and (iii) Waste cycle

• They later participate in a transfer (PFL) phase where they learn a new domain (e.g., nitrogen cycle on land, or global warming).

• We have compared several versions of the system: • ICS – create a map(no teach) with content feedback• LBT – teach Betty with content feedback• T-SRL – teach Betty with SRL feedback• M-SRL – create a map (no teaching) with SRL feedback

IES 2008: Adaptive Tutoring seminar14

Data Analysis

• Performance – learning of domain content• Number of correct concepts + links in students’

final concept maps

• Behaviors – sequence of activities• Key student actions are logged

• Edit map (EM) • Ask query (AQ) • Request quiz (RQ)• Access resources (RA)• Request explanations (RE/CE)• Betty could sometimes take (QT) or refuse (QD) the quiz

IES 2008: Adaptive Tutoring seminar15

Results – Learning Performance

a T-SRL > ICS, p < .05; b T-SRL > LBT, p < .05; c LBT > ICS, p < .05.

Study 1: ICS, LBT, and T-SRL (56 students)

Condition Mean (SD) Map Scores

Main Phase Transfer Phase

ICS 22.83 (5.3) 22.65 (13.7)

LBT 25.65 (6.5)c 31.81 (12.0)

T-SRL 31.58 (6.6)a,b 32.56 (9.9)a

Study 2: ICS, M-SRL, and T-SRL (83 students)

Condition Mean (SD) Map Scores

Main Phase Transfer Phase

ICS 35.80 (10.5) 36.56 (13.61)

M-SRL 38.41 (8.55) 39.66(16.41)

T-SRL 41.79 (7.37)a 42.97(15.83)

IES 2008: Adaptive Tutoring seminar16

Behavior Analysis

• Roscoe, et al. (2008): ICS, LBT, and T-SRL in main study• Map quality was

associated with AQ and RE/CE activities

• AQ & RE/CE may indicate students’ attempts to regulate their own knowledge

Behavior Analysis using HMMs

• Jeong, et al. (2008): ICS, LBT, and T-SRL in main and transfer

• Used hidden Markov models (HMMs) to model learning patterns• States hidden, output

observer• Three patterns related to

SRL differed by condition• Map Building: EM-RA-RQ• Map Probing: AQ-RA• Map Tracing: AQ-RE-CE

• Interpreted models on right

IES 2008: Adaptive Tutoring seminar17

Behavior Analysis with HMMs

• Stationary probabilities show the likelihood of exhibiting a given state

IES 2008: Adaptive Tutoring seminar18

State ICS LBTT-

SRLTransfer

ICSTransfer

LBTTransfer

T-SRL

Map Building

0.72 0.66 0.42 0.73 0.73 0.68

Map Probing

0.24 0.30 0.47 0.25 0.25 0.27

Map Tracing

0.04 0.04 0.11 0.02 0.02 0.05

Pre-Post Test Analysis• Detailed analyses of students’ written responses to

examine learning of five river ecosystem principles• balance, interdependence, microscopic entities,

photosynthesis and cellular respiration, pollution• Learning about “microscopic” entities (e.g., oxygen,

bacteria, and macroinvertebrates) was strongest• Perhaps, because concept map representations make

normally “invisible” concepts explicit.

IES 2008: Adaptive Tutoring seminar19

IES 2008: Adaptive Tutoring seminar20

Current and Future Work• Adaptive Tutoring through Interactive metacognition

• Betty emulates aspects of self-regulated learner• Mentor provides additional metacognitive support to

remind students of important cognitive learning tasks and to help organize these tasks

• Further study of self vs self-other monitoring• Mentor SRL versus Betty SRL

• Increased dose of self-other monitoring• Front-of-class (FOC) Betty

• Moving TA system into classroom – strong links to science curriculum• Adaptive teaching by the classroom teacher(s)

• Learning science• From concepts and their relations to causal reasoning about

chain of events (interdependence)• Aggregate Processes and Balance

http://www.teachableagents.org