Effects of Brain 2
Abstract
The human face is capable of producing thousands of unique expressions and comprises the
primary nonverbal channel for the communication of emotion. In this study, we investigated the
effects of sex and neurological hemispheric dominance on the ability to decode facial
expressions of emotion accurately. On the basis of a battery of measures assessing handedness,
familial sinistrality, and immune disorders, we classified participants as having standard,
anomalous, or mixed hemispheric dominance. Consistent with previous studies, we found that
hemispheric dominance and sex interacted to influence participants’ abilities to decode facial
affect displays from photographs. Specifically, mixed dominant females had the highest
accuracy in the decoding of facial emotion, whereas mixed dominant males had the lowest
accuracy. We discuss these findings within the context of communibiology and comment on
their implications for the study of neurology and social behavior.