The term "schizoaffective psychosis" was introduced by the American psychiatrist Jacob Kasanin in 1933 to describe an episodic psychotic illness with predominant affective symptoms, that was thought at the time to be a good-prognosis schizophrenia. Kasanin's concept of the illness was influenced by the psychoanalytic teachings of Adolf Meyer and Kasanin postulated that "schizoaffective psychosis" was caused by "emotional conflicts" of a "mainly sexual nature" and that psychoanalysis "would help prevent the recurrence of such attacks." He based his description on a case study of nine individuals.