Neurological soft signs and psychopathology: incidence in diagnostic groups.

In earlier studies the authors have reported impairments of cortical function in the parietal and frontal lobes of schizophrenic patients. In this study these results are pursued. The performance of different groups of psychiatric patients with respect to individual neurological soft signs rather than combined cortical function scores, was studied. The potential influence of psychotropic drugs on the significant findings was also analyzed. The results show that specific individual neurologic soft signs are significantly more frequently present in schizophrenics than in either controls or in other psychiatric groups. Additionally, there was no statistical evidence of psychotropic drug effects on the findings.