A contribution to the validity of Leonhard's classification of endogenous psychoses

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Abstract
ABSTRACT–The author made a clinical‐genetical study of the schizophrenias and cycloid (schizoaffective) psychoses following the Leonhardian classification, using the traditional pedigree analysis and multiple threshold method. According to the latter method ‐ on the basis of phenotypical correlations ‐ the systematic schizophrenias could be clearly distinguished from the cycloid psychoses, while the non‐systematic category presumably occupies a genetical position between the two former categories.