II. Impairments in Schizophrenics in Cross-sectional and Longitudinal Perspective — The Mannheim Experience in Two Independent Samples

Abstract
Trimble (1986) has pointed out a shortcoming of the current wave of literature on negative symptoms: there is no overall consensus within psychiatry as to which symptoms and signs are to be considered positive and which negative (Kayton, 1973; Carpenter et al, 1976; Sheldrich et al, 1977; WHO, 1979; Andreasen, 1979; Jablensky, 1981; Crow, 1982, this volume; Rosen et al, 1984; Zubin, 1985; Kulhara et al, 1986).

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