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

Forrester, G.S.; Rawlings, B.; Davila-Ross, M.

doi:10.1002/ajpa.22845

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

Forrester, G.S.; Rawlings, B.; Davila-Ross, M.

Authors

G.S. Forrester

B. Rawlings

M. Davila-Ross

Contributors

Dr Bruce Rawlings bruce.rawlings@durham.ac.uk
Other

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. Methods 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 was investigated. Video recordings of 33 chimpanzees were assessed while they consumed hard‐shelled strychnos fruits. Statistical and descriptive measures of hand dominance to highlight lateralized patterns were explored. 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. Conclusions The results provided empirical evidence in support 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.

Citation

Forrester, G., Rawlings, B., & Davila-Ross, M. (2016). An analysis of bimanual actions in natural feeding of semi‐wild chimpanzees. American journal of physical anthropology, 159(1), 85-92. https://doi.org/10.1002/ajpa.22845

Journal Article Type	Article
Acceptance Date	Aug 14, 2015
Online Publication Date	Sep 8, 2015
Publication Date	Jan 1, 2016
Deposit Date	Sep 21, 2015
Publicly Available Date	May 29, 2018
Journal	American Journal of Physical Anthropology
Print ISSN	0002-9483
Electronic ISSN	1096-8644
Publisher	Wiley
Peer Reviewed	Peer Reviewed
Volume	159
Issue	1
Pages	85-92
DOI	https://doi.org/10.1002/ajpa.22845
Related Public URLs	http://westminsterresearch.wmin.ac.uk/15871/

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Copyright Statement
This is the accepted version of the following article: 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: 85-92, which has been published in final form at https://doi.org/10.1002/ajpa.22845. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.