Asymmetries in moving faces.

One hundred and two right-handed judges viewed a series of 16 frontally displayed moving faces. They reported which side of each face appeared to move more when the faces were seen (a) speaking and (b) performing face exercise (pulling faces). The left-of-the face was judged more mobile than the right at pulling faces, while there was no asymmetry in the judged movement of the speaking face. Viewing conditions (mirror-reversed/normal orientation) affected judgments of exercising faces, but not of speaking faces. There was a leftward bias of judgements of exercising faces, so that a greater left preference when viewing mirror-reversed rather than normally oriented faces. These results are interpreted with reference to explanations of asymmetries in facial expression and interpretation involving notions of cerebral lateralization.