In the early twentieth century the Danish psychiatrist August Wimmer (1872—1937) developed the concept of psychogenic psychosis (PP) as a category of mental disorders separate from schizophrenia and manic depression. It subsumed a variety of clinical conditions with affective, confusional and paranoid features typically triggered by a psychical trauma. Wimmer’s work has established itself as one of the classic texts in Scandinavian psychiatry but, for linguistic reasons, long remained almost unknown in other European countries. Translated into English in 2003, it is now available for historical and psychopathological analyses. This paper describes the original meaning of PP and sets it in context, then discusses the implications arising from the usage of the diagnostic categories introduced to replace PP in modern international classifications.
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