Unitary psychosis

Unitary psychosis (Einheitspsychose) refers to the 19th-century belief prevalent in German psychiatry until the era of Emil Kraepelin that all forms of psychosis were surface variations of a single underlying disease process. According to this model, there were no distinct disease entities in psychiatry but only varieties of a single universal madness and the boundaries between these variants were fluid. The prevalence of the concept in Germany during the mid-19th century can be understood in terms of a general resistance to Cartesian dualism and faculty psychology as expressed in Naturphilosophie and other Romantic doctrines that emphasised the unity of body, mind and spirit.

The concept of unitary psychosis is ultimately derived from the work of the Belgian psychiatrist Joseph Guislain (1797–1860). In 1833 he published Traité Des Phrénopathies ou Doctrine Nouvelle des Maladies Mentales in which he proposed a complex system of psychiatric classification encompassing almost a hundred different mental states. He conceptualised this mosaic of symptoms as arising from any of four consecutive stages in mental disease. These were: "(1) exaltation of the brain's activity, (2) aberration of the brain's structures, (3) oppression of the brain's structures, and (4) exhaustion of psychic energy." For Guislain, what he termed phrénalgie, or mental pain, formed the basis of all mental illness where the "psychic reaction" engendered by "worry, annoyance, pain" or other mental "irritants" brought "physical reactions along with it." Mental illness would then unfold along seven successive stages of progressive deterioration, which he detailed as: hyperphrénie (mania); paraphrénie (folie); hyperplexie (stupidity); hyperspasmie (epilepsy); ideosynchysie (hallucinations); analcouthie (confusion); and noasthénie (dementia).

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