Abstract
As part of his lifelong effort to develop optimal nosologic categories for the non-affective delusional syndromes, in the 1913 8th edition of his textbook, Kraepelin proposed a new diagnosis of paraphrenia presenting with extensive bizarre delusions and auditory hallucinations but no prominent negative symptoms or personality deterioration. He tentatively suggested it was distinct from dementia praecox (DP). His proposal was met with controversy. In an attempt to resolve this matter, Wilhelm Mayer, working with Kraepelin in Munich, published in 1921 the result of a follow-up study of the 78 cases of paraphrenia on the basis of which Kraepelin had developed his new diagnosis. In the 74 cases with adequate follow-up, Mayer’s final diagnoses were 43% DP, 38% paraphrenia, and 18% other. He also presented limited family data, suggesting co-aggregation of DP and paraphrenia. On the basis of these results, Mayer argued that paraphrenia was likely better considered to represent a form of DP and not an independent disorder. His opinion was accepted by nearly all subsequent authors. Mayer’s work appeared nearly a half-century before the proposal of Robin and Guze for the validation of psychiatric disorders by follow-up and family studies. The idea of deciding psychiatric questions on empirical grounds—rather than on the prestige of debating parties—is not a recent discovery but can be traced to the roots of our current diagnostic system in the work of Emil Kraepelin and his associates.
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Acknowledgements
Earlier versions of this paper much benefited from comments, assistance in the gathering of references, and the interpretation of the Germans texts by Drs. Stephan Hecker and Eric Engstrom. Astrid Klee MA translated Mayer’s article and also provided helpful comments on earlier versions.
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Kendler, K.S. Wilhelm Mayer’s follow-up study of Kraepelin’s cases of paraphrenia: diagnostic validity in 1921. Mol Psychiatry 28, 236–241 (2023). https://doi.org/10.1038/s41380-022-01763-9
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DOI: https://doi.org/10.1038/s41380-022-01763-9