Bipolarity, monopolarity and "dichotomous functional decay" as principles of differential diagnosis and "functional pathology" of endogenous psychoses

On the basis of Leonhard's Classification of the endogenous psychoses an attempt is made to trace the phenomenology of the monopolar and bipolar affective psychoses as well as Leonhard's "unsystematic schizophrenias" to three different functional anomalies. The differential diagnosis between the "cycloid psychoses" and the "unsystematic schizophrenias" as well as the problem of the so-called schizoaffective psychoses connected with them, is of particular interest. The arrangement to "functional areas" seems to be suitable.