A model of unidimensional perceptual matching

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Faster “same” than “different” judgments typically are obtained when 2 letters are compared. When 2 tones that might differ only on frequency are compared, however, same judgments typically are slower than different judgments. A uniprocessor, unidimensional model, based on L. E. Krueger's (1978) noisy-operator theory, was fitted satisfactorily to data from 4 published studies on tone comparison (D. Bindra et al, 1965; Bindra, 1968; McColtheart and I. Curthoys, 1968; R. S. Niekerson, 1971). The model predicts faster response time on different judgments because of heterogeneity of difference. Because the 2nd tone in a pair typically may be either higher or lower in frequency than the 1st, there will be a greater variety of perceived difference counts on different pairs than on same pairs. As a result, a large difference count will be decisive and will lead to an immediate “different” response, because it can be produced only by a different pair, whereas a small difference count will not be so decisive because it can be produced by either a same or a different pair. Consequently, there generally will be more rechecking on same than different pairs, and thus longer reaction times on same pairs. (17 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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