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Participants watching a facial expression of emotion tend to respond with the same facial expression. This facial concordance is well known for happiness, but not for other emotions. The present study investigated whether facial expressions of basic six emotions induce facial concordance in participants by average-face method. Facial reactions of 20 subjects were videotaped while watching a facial expression of six emotions performed by amateur actors in a computer display. The six average faces were made from corresponding facial expression of emotions in the display. Newly chosen 62 subjects were asked to classify those average faces into six categories of emotion. The facial concordance was found for happiness and surprise, but not for disgust and fear. However, for average face of anger and that of sadness, classifications were divided into a few categories. This result suggests a possibility that an average faces might have included ambiguous or different faces. It may be necessary to conduct re-classification not with the average-face but with individual faces.

Concordance of facial reactions to facial expressions