Document Detail

Numerosity discrimination in infants: evidence for two systems of representations.
MedLine Citation:
PMID:  12893126     Owner:  NLM     Status:  MEDLINE    
Two experiments investigated numerosity discrimination in 6-month-old infants, comparing their performance on both large numbers (4 vs. 8 elements) and small numbers (2 vs. 4 elements) with both total filled area and total contour length controlled for. These studies provide the first direct comparison between discrimination of small and large numbers in infants with the same methodology, the same type of stimuli, and the same continuous variable controls. Results showed that infants succeeded in discriminating 4 from 8 elements but failed to discriminate 2 from 4 elements, providing evidence for the existence of two systems of number representations in infancy.
Fei Xu
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Cognition     Volume:  89     ISSN:  0010-0277     ISO Abbreviation:  Cognition     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-08-01     Completed Date:  2003-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0367541     Medline TA:  Cognition     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  B15-25     Citation Subset:  IM    
Department of Psychology-125NI, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
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MeSH Terms
Discrimination (Psychology)*
Infant Behavior
Random Allocation
Task Performance and Analysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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