Wilson's disease: a prospective study of psychopathology in 31 cases.

A prospective neuropsychiatric study of 31 consecutive subjects with Wilson's disease is reported. Exploratory factor analysis yielded four factors: neurological, cognitive, hepatic/depressive and psychiatric. Significant associations were found between a 'psychopathic' personality factor and neurological and dysarthria scores. The d' and beta coefficients of a signal-detection memory task dissociated: the former correlated only with Mini-Mental State and Benton visuospatial task; and the latter with depressive symptoms. Using discriminant function analysis, there was efficient classification of 'psychopathic' personality by dysarthria, and of individual depressive symptoms by disturbance of gait. Biochemical markers of hepatic dysfunction were significantly associated with certain depressive symptoms. No evidence emerged to support the putative association with schizophrenia-like psychosis.