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

Forrester, G.S., 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. doi:10.1002/ajpa.22845

TitleAn analysis of bimanual actions in natural feeding of semi-wild chimpanzees
AuthorsForrester, G.S., Rawlings, B. and Davila-Ross, M.
Abstract

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.

Keywordsprimate, behavior, cerebral lateralization, evolution
JournalAmerican Journal of Physical Anthropology
Journal citation159 (1), pp. 85-92
ISSN1096-8644
Year2016
PublisherWiley
Accepted author manuscriptForrester_etal_AJPA_2015.pdf
Digital Object Identifier (DOI)doi:10.1002/ajpa.22845
Publication dates
Published in printJan 2016
Published08 Sep 2015

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