Abstract
The SRA Tests of Primary Mental Abilities were selected as instruments to investigate the hypothesis that differential impairment of intellectual test performance is a concomitant of schizophrenia. A wide variety of hospitalized schizophrenic and normal subjects matched roughly as to age and education were used. The results of this investigation do not support the hypothesis of differential impairment of schizophrenic test performance; however, severe over-all impairment of schizophrenic intellectual performance and differential impairment of performance on certain kinds of intellectual tasks as a result of aging in normals were clearly shown. 28 references.

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