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Proceedings of the Annual Meeting of the Cognitive Science Society
The Shepard, Hovland, & Jenkins (1961) result that Type II (exclusive-or, XOR) category structures are easier to acquire than Type IV (family resemblance, FR) is shown not to replicate with less easily analyzable stimuli. By increasing the number of stimulus dimensions, the traditional XOR advantage emerges in terms of likelihood of reaching a demanding performance criterion, however more errors are actually made during study by XOR learners as compared to FR. Removing borderline instances fromfatcat:42w75ihf7ra3np3ssr6jf5qvqe