Document Detail

Imprinted numbers: newborn chicks' sensitivity to number vs. continuous extent of objects they have been reared with.
MedLine Citation:
PMID:  20712745     Owner:  NLM     Status:  MEDLINE    
Newborn chicks were tested for their sensitivity to number vs. continuous physical extent of artificial objects they had been reared with soon after hatching. Because of the imprinting process, such objects were treated by chicks as social companions. We found that when the objects were similar, chicks faced with choices between 1 vs. 2 or 2 vs. 3 objects chose the set of objects of larger numerosity, irrespective of the number of objects they had been reared with. Moreover, when volume, surface or contour length were controlled for using sets of 1 vs. 4, 1 vs. 6 or 1 vs. 3 objects, chicks resorted to choosing the larger object, rather than the familiar numerosity. When, however, chicks were reared with objects differing in their aspect (colour, size, and shape) and then tested with completely novel objects (of different colour and shape but controlled for continuous extent), they chose to associate with the same number of objects they had been reared with. These results suggest that identification of objects as different and separate individuals is crucial for the computation of number rather than continuous extent in numerical representation of small numerosities and provide a striking parallel with results obtained in human infants. Early availability of small numerosity discrimination by chicks strongly suggests that these abilities are in place at birth.
Rosa Rugani; Lucia Regolin; Giorgio Vallortigara
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Developmental science     Volume:  13     ISSN:  1467-7687     ISO Abbreviation:  Dev Sci     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-17     Completed Date:  2010-12-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9814574     Medline TA:  Dev Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  790-7     Citation Subset:  IM    
Center for Mind/Brain Sciences, University of Trento, Corso Bettini, 31, 38068 Rovereto (Trento), Italy.
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MeSH Terms
Animals, Newborn
Imprinting (Psychology)*
Mathematical Concepts*
Visual Perception*

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

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