1. The psychiatric symptoms and syndromes associated with Parkinson's disease are of 4 general types: (1) psychiatric diseases unrelated to Parkinsonism, (2) reactive mental disturbances, (3) psychiatric symptoms caused by medication, and (4) paroxysmal psychiatric disorders probably related to Parkinson's disease.2. Examples of the 4 types are described in a series of more than 200 patients with the disease.3. The paroxysmal psychiatric disorders usually associated with oculogyric crises (Type 4) are of special interest in that they often comprise formes frustres of psychoses and neuroses, and afford an opportunity for study of the neural correlates of many types of mental disorders.Abstract Teaser