A deficit of primary affective facial expression independent of bucco-facial dyspraxia in chronic schizophrenics

Abstract

Chronic schizophrenics are known to manifest a deficit of categorisation and recognition of primary emotional facial expression despite intact recognition of face identity. An equivalent deficit of expression of the same primary facial emotions in schizophrenics has not been clearly established. Twenty chronic hospitalised schizophrenics and 20 normals were therefore tested on tasks of facial emotional expression upon verbal command, of facial emotional expression imitation, and of non-affective bucco-facial praxic imitation. Results indicate that chronic schizophrenics do manifest a deficit of facial emotion expression which can best be explained by task parameters, such as verbal cueing of emotions, perceptual recognition, and bucco-facial dyspraxia in decreasing order of importance. The deficit does not appear to result from neuroleptic or anticholinergic medication nor length of hospitalisation or disease.