Fourteen rhesus monkeys solved 2-choice simultaneous visual pattern discrimination problems which were designed to provide estimates of the extent to which 2 physical dimensions of metric patterns determine discriminability. The results replicated a previous report that the disparity between the contours (Contour Disparity, CD) of the 2 patterns of a problem is directly related to discriminative performance. In addition, a second dimension of sidedness, Sides Level, was found to be inversely related to performance and independent of CD.
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