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    An analysis of bimanual actions in natural feeding of semi-wild chimpanzees

    Forrester, Gillian and Rawlings, B. and Davila-Ross, M. (2016) An analysis of bimanual actions in natural feeding of semi-wild chimpanzees. American Journal of Physical Anthropology 159 (1), pp. 85-92. ISSN 0002-9483.

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    Objective The objective of the current study was to investigate the lateral dominance for a bimanually coordinated natural feeding behavior in semi-wild chimpanzees. Materials and Methods We investigated strychnos spp. fruit consumption behaviors in semi-wild chimpanzees as an ecologically comparable feeding behavior to those found in cerebral lateralization studies of non-primate species. Video recordings of thirty-three chimpanzees were assessed while they consumed hard-shelled strychnos fruits. We explored statistical and descriptive measures of hand dominance to highlight lateralized patterns. Results Statistical evaluation of feeding bouts revealed a group-level right-handed bias for bimanual coordinated feeding actions, however few individuals were statistically lateralized. Descriptive analyses revealed that the majority of individuals were lateralized and possessed a right-handed bias for strychnos feeding behavior. Discussion The results provide empirical evidence in supports of an early evolutionary delineation of function for the right and left hemispheres. The present findings suggest that great apes express an intermediate stage along the phylogenetic trajectory of human manual lateralization.


    Item Type: Article
    Additional Information: This is the peer reviewed version of the article, which has been published in final form at the link above. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. The field research was partly funded by the European Commission?s FEELIX GROWING project (EC-FP6-IST-045169) and by the Psychology Department, University of Portsmouth
    Keyword(s) / Subject(s): primate, behavior, cerebral lateralization, evolution;
    Depositing User: Administrator
    Date Deposited: 14 Nov 2016 11:40
    Last Modified: 13 Jun 2021 11:03


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