Sixty-six cases of parkinsonism, mostly senile degenerative or postencephalitic, were studied in non-psycho-analytic interviews. Some of the patients also had Rorschach and handwriting studies. The author concludes that parkinsonism is characteristic of a certain personality type. This type is characterized by an urge toward motor activity and aggression in conflict with rigid moralistic tendencies. Various constitutional and psychological causes are enumerated. The disease appears when personality attitudes are interfered with.