Mapping the contribution of single muscles to facial movements in the rhesus macaque

Waller, B.M. ORCID: 0000-0001-6303-7458, Parr, L.A., Gothard, K.M., Burrows, A.M. and Fuglevand, A.J., 2008. Mapping the contribution of single muscles to facial movements in the rhesus macaque. Physiology & Behavior, 95 (1-2), pp. 93-100. ISSN 0031-9384

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The rhesus macaque (Macaca mulatta) is the most utilized primate model in the biomedical and psychological sciences. Expressive behavior is of interest to scientists studying these animals, both as a direct variable (modeling neuropsychiatric disease, where expressivity is a primary deficit), as an indirect measure of health and welfare, and also in order to understand the evolution of communication. Here, intramuscular electrical stimulation of facial muscles was conducted in the rhesus macaque in order to document the relative contribution of each muscle to the range of facial movements and to compare the expressive function of homologous muscles in humans, chimpanzees and macaques. Despite published accounts that monkeys possess less differentiated and less complex facial musculature, the majority of muscles previously identified in humans and chimpanzees were stimulated successfully in the rhesus macaque and caused similar appearance changes. These observations suggest that the facial muscular apparatus of the monkey has extensive homology to the human face. The muscles of the human face, therefore, do not represent a significant evolutionary departure from those of a monkey species. Thus, facial expressions can be compared between humans and rhesus macaques at the level of the facial musculature, facilitating the systematic investigation of comparative facial communication.

Item Type: Journal article
Publication Title: Physiology & Behavior
Creators: Waller, B.M., Parr, L.A., Gothard, K.M., Burrows, A.M. and Fuglevand, A.J.
Publisher: Elsevier
Date: September 2008
Volume: 95
Number: 1-2
ISSN: 0031-9384
S0031938408001467Publisher Item Identifier
Rights: Copyright © 2008 Elsevier Inc. All rights reserved.
Divisions: Schools > School of Social Sciences
Record created by: Linda Sullivan
Date Added: 05 Nov 2020 12:20
Last Modified: 31 May 2021 15:14

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