Document Detail


Throwing behavior and mass distribution of stone selection in tufted capuchin monkeys (Cebus apella).
MedLine Citation:
PMID:  14669268     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cannell [Journal of Archaeological Science 29:335-339, 2002] argued that sex-based differences among humans in terms of the mass of chosen throwing stones could be used to infer body mass and patterns of sexual dimorphism in early hominids from Olduvai and Koobi Fora by examining the mass distributions of unaltered stone tools at those sites. We examined this hypothesis in tufted capuchin monkeys using a comparative approach, by investigating the relationships among body mass, sex, stone weight preference, and accuracy in a throwing task. The subject sample consisted of nine monkeys trained to perform an aimed-throwing task in which a food reward could be obtained by throwing a stone into a bucket. We found that 1) the subjects showed a strong mean stone mass preference; 2) the females chose heavier stones than the males, in terms of absolute mean selected stone mass and selected stone mass relative to body mass; 3) subjects threw more accurately when they used stones of preferred mass vs. stones of nonpreferred mass; and 4) overall, the males were more accurate in the throwing task than the females. We conclude that capuchins are highly selective when choosing throwing stones, and that this confers an advantage for throwing accuracy. Our results indicate that the sexually dimorphic pattern in stone mass preference observed among humans does not generalize to Cebus apella. We suggest that researchers examining this pattern in humans in an attempt to explain early hominid patterns of dimorphism and behavior should take into account not only stone weight preference, but also its adaptive advantage.
Authors:
A Cleveland; A R Rocca; E L Wendt; G C Westergaard
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of primatology     Volume:  61     ISSN:  0275-2565     ISO Abbreviation:  Am. J. Primatol.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-12-11     Completed Date:  2004-02-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8108949     Medline TA:  Am J Primatol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  159-72     Citation Subset:  IM    
Copyright Information:
Copyright 2003 Wiley-Liss, Inc.
Affiliation:
Division of Research and Development, LABS of Virginia, Inc., Yemassee, South Carolina 29945, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Constitution
Cebus / physiology*
Female
Functional Laterality
Male
Motor Skills*
Orientation
Sex Characteristics*
Grant Support
ID/Acronym/Agency:
R03 HD39647-01A1/HD/NICHD NIH HHS

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


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