title: Preference for human direct gaze in infant chimpanzees (Pan troglodytes).
abstract: We studied gaze perception in three infant chimpanzees (Pan troglodytes), aged 10-32 weeks, using a two-choice preferential-looking paradigm. The infants were presented with two photographs of a human face: (a) with the eyes open or closed, and (b) with a direct or an averted gaze. We found that the chimpanzees preferred looking at the direct-gaze face. However, in the context of scrambled faces, the infants showed no difference in gaze discrimination between direct and averted gazes. These findings suggest that gaze perception by chimpanzees may be influenced by the surrounding facial context. The relationship between gaze perception, face processing, and the adaptive significance of gaze perception are discussed from an evolutionary perspective.
authors.affiliation: Primate Research Institute, Kyoto University, Inuyama, 484-8506 Aichi, Japan. Masako.Myowa@bun.kyoto-u.ac.jp
authors.forename: Masako
authors.initials: M
authors.lastname: Myowa-Yamakoshi
authors.forename: Masaki
authors.initials: M
authors.lastname: Tomonaga
authors.forename: Masayuki
authors.initials: M
authors.lastname: Tanaka
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Matsuzawa
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D003142:Communication; D004193:Discrimination Learning; D005145:Face; D005260:Female; D006801:Humans; D008297:Male; D002679:Pan troglodytes / Q000254:growth & development / Q000523:psychology*; D012938:Social Perception