The experiment investigated the relative ease with which 30 adult human subjects in college could identify relevant attributes and rules relating them in a series of tasks in which five-dimensional truth tables were used as stimuli. The results indicated that two- and three-dimensional conjunctive concepts were attained as easily as simple concepts. Inclusive disjunctive concepts were more difficult, except when negation was involved. Subjects tended to solve disjunctive tasks by using conjunctive hypotheses and, rather than identify why some statements were true (which was the required response), they would specify the conditions which made the remaining statements false.
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