Abstract
Sixteen Ss made same-different choice reactions (CRT) to 10 pairs of pure tones differing from 10 to 100 Hz (different) and 6 pairs of zero frequency difference (same). Results indicated that, based on the number of errors, the stimuli represented three different perceptual levels. The first level was assumed to represent items below S's level of discrimination, the second an interaction of discriminability and dissimilarity and the third dissimilarity only. The CRTs for the items below S's discrimination level were lower than items representing an interaction between dissimilarity and discriminability. Thus, items missed most often were reacted to with CRTs less than what would be expected. Rate of information transmission in bits/seconds provided a single positive function of the logarithm of stimulus dissimilarity over the entire range of frequency difference values.
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