Journal
BRAIN AND COGNITION
Volume 75, Issue 2, Pages 164-169Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bandc.2010.11.004
Keywords
Hemispheric specialization; Oro-facial asymmetries; Emotions; Olive baboons; Laterality; Social interactions; Screeching; Lip-smacking; Eyebrow-raising; Copulation call
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Funding
- French National Research Agency (ANR) [ANR-08-BLAN-0011_01]
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0011] Funding Source: Agence Nationale de la Recherche (ANR)
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Asymmetries of emotional facial expressions in humans offer reliable indexes to infer brain lateralization and mostly revealed right hemisphere dominance. Studies concerned with oro-facial asymmetries in nonhuman primates largely showed a left-sided asymmetry in chimpanzees, marmosets and macaques. The presence of asymmetrical oro-facial productions was assessed in Olive baboons in order to determine the functional cerebral asymmetries. Two affiliative behaviors (lipsmack, copulation call) and two agonistic ones (screeching, eyebrow-raising) were recorded. For screeching, a strong and significant left hemi-mouth bias was found, but no significant bias was observed for the other behaviors. These results are discussed in the light of the available literature concerning asymmetrical oro-facial productions in nonhuman primates. In addition, these findings suggest that human hemispheric specialization for emotions has precursors in primate evolution. (C) 2010 Elsevier Inc. All rights reserved.
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