[Updated on July 12] Integration of CiNii Articles into CiNii Research from April 1, 2022


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  • Lateralization for the Production of Facial Expressions in Infant Chimpanzees and Humans(Infant & Nursery Education, Developmental Psychology)

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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.





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