title: Contrast of hemispheric lateralization for oro-facial movements between learned attention-getting sounds and species-typical vocalizations in chimpanzees: extension in a second colony.
abstract: Studies involving oro-facial asymmetries in nonhuman primates have largely demonstrated a right hemispheric dominance for communicative signals and conveyance of emotional information. A recent study on chimpanzee reported the first evidence of significant left-hemispheric dominance when using attention-getting sounds and rightward bias for species-typical vocalizations (Losin, Russell, Freeman, Meguerditchian, Hopkins & Fitch, 2008). The current study sought to extend the findings from Losin et al. (2008) with additional oro-facial assessment in a new colony of chimpanzees. When combining the two populations, the results indicated a consistent leftward bias for attention-getting sounds and a right lateralization for species-typical vocalizations. Collectively, the results suggest that both voluntary-controlled oro-facial and gestural communication might share the same left-hemispheric specialization and might have coevolved into a single integrated system present in a common hominid ancestor.
authors.affiliation: Department of Psychology, Center for Research in the Psychology of Cognition, Language and Emotion, Aix-Marseille University, France. catherine.wallez@univ-amu.fr
authors.forename: Catherine
authors.initials: C
authors.lastname: Wallez
authors.forename: Jennifer
authors.initials: J
authors.lastname: Schaeffer
authors.forename: Adrien
authors.initials: A
authors.lastname: Meguerditchian
authors.forename: Jacques
authors.initials: J
authors.lastname: Vauclair
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Schapiro
authors.forename: William D
authors.initials: WD
authors.lastname: Hopkins
mesh_terms: D000819:Animal Communication; D000818:Animals; D001288:Attention / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology*; D004644:Emotions / Q000502:physiology*; D005149:Facial Expression; D005152:Facial Muscles / Q000294:innervation* / Q000502:physiology; D005260:Female; D008297:Male; D002679:Pan troglodytes; D013045:Species Specificity; D014828:Vocalization, Animal / Q000502:physiology*