Document Detail

Tufted capuchins (Cebus apella) attribute value to foods and tools during voluntary exchanges with humans.
MedLine Citation:
PMID:  12884078     Owner:  NLM     Status:  MEDLINE    
This research examined exchange and value attribution in tufted capuchin monkeys ( Cebus apella). We presented subjects with opportunities to obtain various foods and a tool from an experimenter in exchange for the foods or tool in the subjects' possession. The times elapsed before the first chow biscuits were expelled and/or an exchange took place were recorded as the dependent measures. Laboratory chow biscuits, grapes, apples, and a metal bolt (a tool used to probe for syrup) were used as experimental stimuli. The subjects demonstrated the ability to recognize that exchanges could occur when an experimenter was present with a desirable food. Results indicate that subjects exhibited significant variation in their willingness to barter based upon the types of foods that were both in their possession and presented by the experimenter. Subjects more readily traded chow biscuits for fruit, and more readily traded apples for grapes than grapes for apples. During the exchange of tools and food, the subjects preferred the following in descending order when the probing apparatus was baited with sweet syrup: grapes, metal bolts, and chow biscuits. However when the apparatus was not baited, the values changed to the following in descending order: grapes, chow, and metal bolts. These results indicate that tufted capuchins recognize opportunities to exchange and engage in a simple barter system whereby low-valued foods are readily traded for more highly valued food. Furthermore, these capuchins demonstrate that their value for a tool changes depending upon its utility.
Gregory C Westergaard; Chanya Liv; Andrea M Rocca; Allison Cleveland; Stephen J Suomi
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Publication Detail:
Type:  Journal Article     Date:  2003-07-19
Journal Detail:
Title:  Animal cognition     Volume:  7     ISSN:  1435-9448     ISO Abbreviation:  Anim Cogn     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-01-27     Completed Date:  2004-03-19     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9814573     Medline TA:  Anim Cogn     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  19-24     Citation Subset:  IM    
Division of Research and Development, LABS of Virginia, Inc., 95 Castle Hall Road, P.O. Box 557, Yemassee, SC 29945, USA.
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MeSH Terms
Cebus / physiology*
Object Attachment*
Social Behavior*

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

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