Document Detail

Infants use different mechanisms to make small and large number ordinal judgments.
MedLine Citation:
PMID:  22608189     Owner:  NLM     Status:  Publisher    
Previous research has shown indirectly that infants may use two different mechanisms-an object tracking system and an analog magnitude mechanism-to represent small (<4) and large (⩾4) numbers of objects, respectively. The current study directly tested this hypothesis in an ordinal choice task by presenting 10- to 12-month-olds with a choice between different numbers of hidden food items. Infants reliably chose the larger amount when choosing between two exclusively small (1 vs. 2) or large (4 vs. 8) sets, but they performed at chance when one set was small and the other was large (2 vs. 4) even when the ratio between the sets was very favorable (2 vs. 8). The current findings support the two-mechanism hypothesis and, furthermore, suggest that the representations from the object tracking system and the analog magnitude mechanism are incommensurable.
Kristy Vanmarle
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-16
Journal Detail:
Title:  Journal of experimental child psychology     Volume:  -     ISSN:  1096-0457     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985128R     Medline TA:  J Exp Child Psychol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Department of Psychological Sciences, University of Missouri-Columbia, Columbia, MO 65211, USA.
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