AT PRESENT the primary role of psychologists working in the clinical field is that of technical ancillary concerned with the application of standardized psychological tests. The usefulness of such tests has several limitations. Without a minimal degree of cooperation on the part of the patient it may not be possible to apply psychological tests at all. Scores obtained on most psychiatric tests can be influenced by many peripheral factors whose cumulative effect may be considerable. Furthermore, a limitation of the cognitive test is that it is a gross measure of performance, on which identical scores may be obtained by patients with different disabilities. For example, performance on the arithmetic subtest of the Wechsler Adult Intelligence Scale (WAIS) may be impaired because the patient (a) does not know the answer, (b) is retarded and hence is unable to give the answer within the
HUTT C, COXON MW. Systematic Observation in Clinical Psychology. Arch Gen Psychiatry. 1965;12(4):374–378. doi:10.1001/archpsyc.1965.01720340046007
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