Document Detail

Ordinal judgments and summation of nonvisible sets of food items by two chimpanzees and a rhesus macaque.
MedLine Citation:
PMID:  16045389     Owner:  NLM     Status:  MEDLINE    
Two chimpanzees and a rhesus macaque rapidly learned the ordinal relations between 5 colors of containers (plastic eggs) when all containers of a given color contained a specific number of identical food items. All 3 animals also performed at high levels when comparing sets of containers with sets of visible food items. This indicates that the animals learned the approximate quantity of food items in containers of a given color. However, all animals failed in a summation task, in which a single container was compared with a set of 2 containers of a lesser individual quantity but a greater combined quantity. This difficulty was not overcome by sequential presentation of containers into opaque receptacles, but performance improved if the quantitative difference between sizes was very large.
Michael J Beran; Mary M Beran; Emily H Harris; David A Washburn
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of experimental psychology. Animal behavior processes     Volume:  31     ISSN:  0097-7403     ISO Abbreviation:  J Exp Psychol Anim Behav Process     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-07-27     Completed Date:  2005-10-19     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7504289     Medline TA:  J Exp Psychol Anim Behav Process     Country:  United States    
Other Details:
Languages:  eng     Pagination:  351-62     Citation Subset:  IM    
Copyright Information:
Copyright 2005 APA, all rights reserved).
Language Research Center, Georgia State University, Decatur, 30034, USA.
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MeSH Terms
Behavior, Animal
Chi-Square Distribution
Color Perception / physiology
Judgment / physiology*
Macaca mulatta
Pan troglodytes
Serial Learning / physiology*
Size Perception
Grant Support

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

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