Multiple personality. A single case study with a 15 year follow-up.

A review of the literature relating to multiple personality is presented together with a study of a single case of hysterical aetiology that demonstrates the development of multiple personality from a fugue amnesic state. A re-examination of this case after 15 years without significant psychotherapeutic intervention demonstrates a tendency towards remission. The view that multiple personality is a form of fugue, not necessarily hysterical, in which an alternative personality is adopted and that this behaviour is reinforced by the attention that it receives, is discussed.