In the current issue of Schizophrenia Bulletin, Ken Kendler traces the development of catatonia from Kahlbaum’s 1874 monograph to the 1899 edition of Kraepelin’s psychiatry textbook.1 It complements 2 recent manuscripts in which he reviewed the development of the diagnostic concepts hebephrenia2 and dementia paranoides/paranoia.3 Kendler’s publications are a detailed analysis of texts by Emil Kraepelin, who merged 3 previously separate clinical syndromes into a new diagnostic entity, dementia praecox, later renamed schizophrenia by Eugen Bleuler.4
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