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Although most people can identify facial expressions of emotions well, they still differ in this ability. According to embodied simulation theories understanding emotions of others is fostered by involuntarily mimicking the perceived expressions, causing a “reactivation” of the corresponding mental state. Some studies suggest automatic facial mimicry during expression viewing; however, findings on the relationship between mimicry and emotion perception abilities are equivocal. The present study investigated individual differences in emotion perception and its relationship to facial muscle responses - recorded with electromyogram (EMG) - in response to emotional facial expressions.  N ° = °269 participants completed multiple tasks measuring face and emotion perception. EMG recordings were taken from a subsample ( N ° = °110) in an independent emotion classification task of short videos displaying six emotions. Confirmatory factor analyses of the  m. corrugator supercilii  in response to angry, happy, sad, and neutral expressions showed that individual differences in  corrugator  activity can be separated into a general response to all faces and an emotion-related response. Structural equation modeling revealed a substantial relationship between the emotion-related response and emotion perception ability, providing evidence for the role of facial muscle activation in emotion perception from an individual differences perspective.

Facial EMG Responses to Emotional Expressions Are Related to Emotion Perception Ability