Abstract
2 groups of mental defectives, a high MA group (with a mean of 8.02 yr. on the revised Stanford-Binet Intelligence Test) and a low MA group (with a mean of 5.05 yr.) learned 10 successive object-quality discrimination problems under conditions which were favorable to the formation of learning sets. The results indicated that learning sets did develop in both groups. The group with the higher MA acquired more efficient sets and also acquired sets more rapidly than did the low MA group. The mean CA for the high MA group was 14.75 yr. and 13.63 yr. for the low MA group. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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