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11 Caesar Greek x1 x2 x3 x4 x5 x6 Classification xnew ? Category generation Caesar Greek x1 x2 x3 x4 x5 x6 xnew ? Test

Alan Jern Charles Kemp Carnegie Mellon University

Category Generation

Category generation: Introduction

Observation: people can imagine and create new objects 2 Category generation Spork Cobb salad Griffin T. Ward (1994)

Outline

Define category generation Modeling approach Experiment 3

Category generation

Can occur at any level in a taxonomy Exemplar level 4 Category level

Category generation

This talk 5

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Caesar Greek x1 x2 x3 x4 x5 x6 Training Classification

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Caesar Greek x1 x2 x3 x4 x5 x6 Test xnew ? Classification

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Caesar Greek x1 x2 x3 x4 x5 x6 Classification xnew ? Caesar Greek x1 x2 x3 x4 x5 x6 Training Category generation

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Caesar Greek x1 x2 x3 x4 x5 x6 Classification xnew ? Category generation Caesar Greek x1 x2 x3 x4 x5 x6 xnew ? Test

Past modeling approaches

Classification Prototype model (Reed, 1972) GCM (Nosofsky, 1985) Rational model (Anderson, 1991) ALCOVE (Kruschke, 1992) SUSTAIN (Love et al., 2004) Category generation ? 10

11 Caesar Greek x1 x2 x3 x4 x5 x6 Classification xnew ? Category generation Caesar Greek x1 x2 x3 x4 x5 x6 xnew ? Test

Our approach

Bayesian Learn category distribution Sample from that distribution 12

A category generation task

13 M K G X M B R X W K G R …

An exemplar generation task

14 Slot 1 Slot 2 MX MX HF WR Slot 2 G K G K N B V S Slot 1 Pieces M K G X M B N X W K G R Structure cf. Fiser & Aslin, 2001

Task model

15 M K G X M B N X W K G R Structure Slot 1 Slot 2 MX MX HF WR Slot 2 G K G K N B V S Slot 1 ? Slots ? W B N R

Experimental Design 18 CMU undergraduates 3 structures (3 conditions) 16

Materials

1 2 3 4 1 2 3 4 17 Slot 1 Slot 2 Seen combination Z N Q J V S W K DB RL XM HF

Procedure

18 ‹#›

Humans

Results 19 No item generated more than twice Model 1 2 3 4 1 2 3 4 58% of responses (Hypothesis space: 1820 possible responses)

Results

Classification task Rate likelihood of new instances 20 Valid All Distractors 3 Seen Pairings 2 Seen Pairings 1 Seen Pairing

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Name: 
catgen_cogsci09talk
Author: 
Alan Jern
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Description: 
11 Caesar Greek x1 x2 x3 x4 x5 x6 Classification xnew ? Category generation Caesar Greek x1 x2 x3 x4 x5 x6 xnew ? Test
Tags: 
categori | generat | slot | caesar | greek | classif | xnew | model
Created: 
7/29/2009 5:23:58 PM
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