Handedness in schizophrenia.

Handedness was assessed in 272 schizophrenics and compared with findings in normal controls. The schizophrenics differed significantly from the normal controls in their handedness patterns, having a higher proportion of fully right-handed subjects. Findings in brain-damaged and elderly schizophrenic patients are also reported. The lack of consistency of reporting of handedness in a schizophrenic populations in previous studies is discussed. While it is probable that differences in the methods of study of handedness account for some of the variance, differences in the type of schizophrenic illness seem likely to be of greater importance.