Origin of the Term "Bipolar Disorder": Emil Kraepelin and the Two Poles of Mood
The term "bipolar disorder" was introduced by German psychiatrist Emil Kraepelin in his 1899 textbook Psychiatrie: Ein Lehrbuch für Studierende und Ärzte (6th edition).
Historical Context
- Kraepelin unified "mania" and "melancholia" under manic-depressive insanity (later "manic-depressive psychosis").
- He chose "bipolar" to reflect the two poles of mood: mania (exaltation) and depression (melancholia), with intervals of normalcy.
- This contrasted with "dementia praecox" (schizophrenia), which he saw as a deteriorating course.
Evolution
- 1957: Karl Leonhard subclassified unipolar vs. bipolar.
- 1980: DSM-III adopted "Bipolar Disorder" (replacing manic-depressive illness).
- DSM-5 (2013): Bipolar I, II, cyclothymic, substance/med-induced, other specified.
Kraepelin's dimensional view—mood illness as a recurrent, often remitting condition—remains foundational.
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