14 rhesus monkeys were presented 2-choice simultaneous visual pattern discrimination problems which were designed to provide estimates of the extent to which 3 physical dimensions of metric patterns determine discriminability. The results replicated our previous reports that discriminative performance was directly related to Element Disparity (ED) and Contour Disparity (CD), and that the ED and CD effects were independent. Performance was inversely related to a trichotomous dimension of Pattern Complexity (PC), but a more detailed analysis revealed that the effect of PC could be attributed solely to the effect of the Sides Level (SL) dimension identified previously.
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