The diagnostic concept and classification of chronic depressions has long been a matter of controversy. Kraepelin (1921) considered chronic depression to be a ‘rudiment’ of fully developed manic-depressive insanity, and this view was shared by Slater & Roth (1969), who cited occasional dramatic improvement in patients with neurasthenic disorder when they received convulsive therapy.
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Declan Murphy (1991) studied this question.
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