The asymmetries of facial expression were estimated in a sample of 14 experimental subjects with the Facial Action Coding System during voluntary control of facial mimicry while viewing videotapes. The subjects were instructed to express facially the emotion experienced or to dissimulate their true emotion with a facial expression opposite (incongruous) to what they actually felt. Only during dissimulation did facial mimicry show an asymmetric distribution toward the lower left side of the face.
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