Abstract
This paper will review the use of the electromyographic (EMG) technique for studying asymmetry and laterality in facial behavior. My discussion will include several issues: (1) a review of the neurology of facial expression with respect to asymmetry/laterality; (2) a compendium of models of cerebral hemispheric participation in emotion and in facial motor control that imply asymmetry-laterality in facial behavior: (3) a summary of facial asymmetry-laterality findings to date; and (4) uses and abuses of EMG techniques in inferring asymmetry-laterality in facial behavior. I conclude with (5) recommendations for future facial asymmetry-laterality research in general.