Abstract
Right-handed subjects attempted five different lateral facial actions: winking, eyebrow raising, mouth corner raising, nose wrinkling and mouth corner lowering. Males exhibited significantly greater left side facial facility than did females. The findings lend support to the suggestion that there is a neuroanatomical sex difference in the control of facial expression. For females only, the findings also support the suggestion that the habitual hiding of one's emotions produces greater lateral facial facility.
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