The perception of emotional chimeric faces in XXXX : further evidence of right hemisphere dysfunction.

@entity1 @entity161
OBJECTIVE: To examine lateral perceptual bias, an index of right hemisphere function, and its relation to performance on a standard facial perception test and to clinical variables in a large sample of first episode and chronic @entity161 . BACKGROUND: Judgments made on chimeric faces reliably elicit a perceptual bias to the left hemispace, presumed to be a result of right hemisphere dominance for spatial attention. Recent studies have suggested that this bias is reduced or absent in @entity1 with @entity161 . METHODS: Fifty first-episode and 50 @entity1 with chronic @entity161 and 50 control subjects were given a brief neuropsychologic battery that included a Happy-Sad Chimeric Face test and the Benton Facial Recognition Test. All @entity1 were rated on the Positive and Negative Syndrome Scale of @entity161 after 4 weeks of neuroleptic treatment. All were right handed RESULTS: The @entity1 with @entity161 showed a significantly weaker perceptual left hemispatial bias compared with controls. In fact the mean bias was in the opposite direction in the chronic group. There was no correlation between left hemispatial bias and either positive or negative symptoms, current medication dose, or mood. Results from the Benton test revealed a performance deficit among the @entity1 with @entity161 compared with controls but was not correlated with performance on the chimeric faces test in the @entity1 . CONCLUSIONS: The results confirm a specific deficit in right hemisphere attentional functions in @entity161 , which is separate from a general impairment in facial processing. The deficit is most marked in chronic @entity1 but further study is required to determine whether this is a consequence of prolonged illness.
