Document Detail

Size matters: impact of item size and quantity on array choice by chimpanzees (Pan troglodytes).
MedLine Citation:
PMID:  11334213     Owner:  NLM     Status:  MEDLINE    
The authors previously reported that chimpanzees (Pan troglodytes) showed a striking bias to select the larger of 2 candy arrays, despite a reversed reward contingency in which the animals received the smaller, nonselected array as a reward, except when Arabic numerals were used as stimuli. A perceptual or incentive-based interference occurred that was overcome by symbolic stimuli. The authors of the present study examined the impact of element size in choice arrays, using 1 to 5 large and small candies. Five test-sophisticated chimpanzees selected an array from the 2 presented during each trial. Their responses were not optimal, as animals generally selected arrays with larger total mass; thus, they received the smaller remaining array as a reward. When choice stimuli differed in size and quantity, element size was more heavily weighted, although choices reflected total candy mass. These results replicate previous findings showing chimpanzees' difficulties with quantity judgments under reverse reward contingencies and also show that individual item size exerts a more powerful interference effect.
S T Boysen; G G Berntson; K L Mukobi
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of comparative psychology (Washington, D.C. : 1983)     Volume:  115     ISSN:  0735-7036     ISO Abbreviation:  J Comp Psychol     Publication Date:  2001 Mar 
Date Detail:
Created Date:  2001-05-03     Completed Date:  2001-09-13     Revised Date:  2014-03-25    
Medline Journal Info:
Nlm Unique ID:  8309850     Medline TA:  J Comp Psychol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  106-10     Citation Subset:  IM    
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MeSH Terms
Behavior, Animal*
Choice Behavior*
Concept Formation*
Pan troglodytes / psychology*
Size Perception*
Grant Support

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

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