Einheitspsychosen

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The theory of Einheitspsychosen (literally, the unity of psychoses) was put forth by the German psychiatrist Heinrich Neumann in 1859. The main postulate of the theory was that all psychoses represent a single disorder.

This theory has been much criticised, particularly since the distinction made by Kraepelin between schizophrenia and manic-depressive disorder. In the nineteenth century, people such as Karl Wernicke or Kleist believed that psychoses were a discrete class of disorders, whereas people such as Neumann believed that all psychoses were part of the same nosological category.

Karl Kahlbaum was a fierce opponent of Neumann's view. Kraepelin's contribution can be considered a compromise between the positions of Neumann and Kahlbaum, stating that all psychoses can be fitted into one of two basic categories - dementia praecox (now called schizophrenia) or manic-depressive psychosis.

Although today, many clinicians would dispute this doctrine, holding that one should at least make the distinction between schizophrenia and manic-depressive psychosis proposed by Kraepelin, the theory continues to have some influence. Eysenck (1992a), for example, in describing the trait of psychoticism does so with very similar assumptions to those made by Neumann. Eysenck (1992b) has claimed that a low level of platelet monoamine oxidase may be the biological marker that links all psychoses.

See also: Psychoticism

References

• Eysenck, H. J. (1992a). "Four ways five factors are not basic." Personality and Individual Differences, 13, 667-676.
• Eysenck, H. J. (1992b). "The definition and measurement of psychoticism." Personality and Individual Differences, 13, 757-785.
• Lanczik, M. (1992). Karl Kahlbaum (1828-1899) and the Emergence of Psychopathological and Nosological Research in German psychiatry. History of Psychiatry 3, 53-58.
• Shorter, E. A History of Psychiatry.

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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .