Spontaneous expression of facial emotion in schizophrenic and right-brain-damaged patients

The primary neuropsychological theories of schizophrenia have emphasized disturbed dominant hemisphere functioning, although schizophrenics (SZs), particularly those with flat affect, may have deficits resembling those of patients with damage to their right hemisphere. SZs, right-brain-damaged patients (RBDs), and normal controls (NCs) were videotaped while talking about a pleasant and an unpleasant experience. Raters viewed the video recordings of facial activity with the audio portion turned off and assessed the intensity of emotion, the amount of positive emotion, and the amount of negative emotion. Compared to controls, both patient groups were judged as less expressive and as displaying more negative than positive emotion. In particular, the patients seemed to have difficulty with the expression of positive feelings. For the SZ group, these findings may be related to anhedonia or to poor social functioning, which are often features of the illness. The findings for the RBD group are contrary to previous studies which have suggested that the right hemisphere is specialized for negative emotion.