Hemispheric asymmetries in the perception of emotional and neutral faces.

This study was designed to investigate hemispheric asymmetries in the perception of both positive and negative emotion, while minimizing extraneous factors known to favour right hemisphere processes. Pairs of faces (happy-neutral or sad-neutral) were presented, one to each visual field, and subjects responded to the face that made them feel either better or worse. Performance was superior when the emotional faces were presented to the left visual field-right hemisphere. This occurred in both the better and the worse conditions, and for both sexes. Indeed, the data indicate that all emotional stimuli were being processed by the right hemisphere, and that the effect for emotional faces is due to the expressions and not merely the faces themselves.