チンパンジー乳児とヒト乳児における表情表出の左右差(幼児教育・発達心理)

概要

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Human and non-human primates have in common, facial emotional expressions as one of the means of communication. Facial emotion plays a very important part for primates and human infants who have not yet acquired spoken language. This article focuses on lateralization for the production of facial emotion in infant humans, adult humans, and infant chimpanzees. We constructed composite chimera faces of the right or left side of their frontal facial emotions, such as smiling and crying faces. We presented subjects two chimeras, that is, right and left facial emotions, and asked them to judge which face expressed the stronger emotion. Results showed clear asymmetry in the strength of facial emotion in infant humans, adult humans, and infant chimpanzees indicating that facial emotion is expressed more strongly on the left side than the right side. Our present results suggest a right hemispheric dominance in facial emotion, especially in negative emotion, in infant humans and chimpanzees, as well as adult humans.
昭和女子大学の論文
2007-06-01