The manic-depressive psychosis is not a new subject for psychiatric observation or psychoanalytic formulation, nor is the cyclothymic personality without some excellent discussion. Manic-depressive psychosis is defined as a severe chronic mental disorder characterized by strikingly dissimilar phases which may follow each other with or without intervals of normality or may recur without the contrasting phase; the one phase includes acceleration of thought, hyperactivity, flight of ideas and distractibility, with resulting serious disturbances of judgment; the other phase is defined by poverty of ideation, hypo-activity and restriction of thought to a few grief-provoking ideas. The cyclothymic personality is viewed generally as an incomplete version of the psychosis, an abortive form of it or the manifestation of its anlage.
The clinical material of the Cook County Psychopathic Hospital that has come to my attention during the past fifteen years has included many cases in which the condition was diagnosed according to
BLITZSTEN NL. AMPHITHYMIA: SOME SYNDROMES OF DEPRESSION AND ELATION. Arch NeurPsych. 1936;36(5):1021–1036. doi:10.1001/archneurpsyc.1936.02260110106008
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