A Facial-Action Imposter: How Head Tilt Influences Perceptions of Dominance From a Neutral Face.

Research on face perception tends to focus on facial morphology and the activation of facial muscles while ignoring any impact of head position. We raise questions about this approach by demonstrating that head movements can dramatically shift the appearance of the face to shape social judgments without engaging facial musculature. In five studies (total N = 1,517), we found that when eye gaze was directed forward, tilting one's head downward (compared with a neutral angle) increased perceptions of dominance, and this effect was due to the illusory appearance of lowered and V-shaped eyebrows caused by a downward head tilt. Tilting one's head downward therefore functions as an action-unit imposter, creating the artificial appearance of a facial action unit that has a strong effect on social perception. Social judgments about faces are therefore driven not only by facial shape and musculature but also by movements in the face's physical foundation: the head.