Cognitive Disorder Among the Schizophrenias—III. Retardation

Abstract
As part of a larger study of cognitive disorder among the schizophrenias (Foulds et al., 1967a, 1967b), aspects of retardation were investigated. The relation of retardation to other forms of thought disorder in schizophrenia has been extensively investigated by Payne (Payne, 1960, 1962; Payne, Ancevich and Laverty, 1963; Payne, Caird and Laverty, 1964; Payne and Caird, 1967) who has used the three Babcock tests (Babcock and Levy, 1940), and the Wechsler Digit Symbol test as his measuring instruments.

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