This work is a continuation of efforts to develop a psychophysics of form similarity appropriate to the study of concept learning. 5 configurations of dots (Triangle, Diamond, M, F, and Random) were studied. The psychophysical functions relating perceived distance from the original to each level of distortion were linear. The level of distortion was calculated from the statistical rule generating the distortions and expressed in terms of uncertainty. It also reflected the mean distance that each dot actually gravitated over random samples of the rule. The perceived distance between any pair of distortions increased with the level of the more distorted from the original. The level of distortion of a sample of patterns was related to the rate at which Ss learned a common response to that sample. Rate of learning in classifying these patterns, like multivariate concept learning, is a function of the uncertainty within a category.
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