Wechsler Adult Intelligence Scale Performance of Familial and Undifferentiated Mental Subnormals

Patients with the diagnoses of familial and undifferentiated mental retardation are often treated as a homogeneous group in research on mental subnormality, particularly in psychological studies where intelligence is a variable. This study investigated the homogeneity of subtest performance of familial and undifferentiated retardates1 on the Wechsler Adult Intelligence Scale ( WAIS) . From a larger pool of WAIS data, 40 familial and 40 undifferentiated Ss were selected at each of three age levels (16 to 24 yr., 25 to 34 yr., and 35 to 44 yr.) and individually matched for age, sex, and Full Scale IQ. The total sample was thus set at 240. Critical ratios between the mean subtest scores of the two diagnostic groups were calculated at each age level. As none of the 33 differences were significant at .05, combined Ms and SDs are given in Table 1. Familial and undifferentiated mental retardates are alike wich respect to their WAIS subtest performance. This finding provides some empirical justification for combining the two diagnostic groups in psychological studies

Cognition · Developmental psychology · Homogeneous · Intelligence quotient · Mental age · Psychiatry · Wechsler Adult Intelligence Scale · Wechsler Intelligence Scale for Children · Wechsler Preschool and Primary Scale of Intelligence · Clinical Psychology · Cognitive Abilities and Testing · Genetic Associations and Epidemiology · Genetics and Neurodevelopmental Disorders · Psychology

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