Abstract
In four diagnostic categories (Organic Brain-damaged, Psychiatric, Familial, Undifferentiated) of institutionalized retardates Ss were individually matched across the categories on age and Full Scale Wechsler-Bellevue IQ (Ns = 16). Intergroup comparisons were made of performance on a battery of 26 psychological measures which were ranked on a continuum ranging from tests judged to be most dependent upon immediate problem-solving ability to tests judged most dependent upon experiential background for task success. The results showed that the Familial group performed significantly better than the other three categories on tests within the problem-solving half of the continuum, and that the Familial group performed significantly more poorly than the other three groups on measures within the experiential background half of the distribution. The differential diagnostic and group composition implications of the results were discussed in relation to previously reported studies involving similar groups.
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