Emil Kraepelin suggested that several types of psychosis should be distinguished from manic-depressive disorders and classified together under one category called

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Emil Kraepelin proposed the distinction between dementia praecox (now known as schizophrenia) and manic-depressive disorder (now known as bipolar disorder) in the late 19th and early 20th century. He believed that these two conditions were fundamentally different and should be classified separately. Kraepelin also proposed a category called "paranoid-hallucinatory insanity" which included several types of psychosis, including what is now known as schizophrenia. Kraepelin's work had a significant impact on the development of modern psychiatric classification systems.

Emil Kraepelin Suggested That Several Types of Psychosis Should Be