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It has been suggested that information-integration (two-dimensional) category boundaries can be learned with immediate but not delayed feedback because of the time course of the dopamine function in the brain (Maddox, Ashby & Bohil, 2003). Here we examined the role of feedback delay in visual perceptual learning in an orientation identification task. Contrast thresholds were measured in a 2AFC orientation task tracking 65% correct at 5.4 degree in the periphery (eg, five-sessions of training with-55±8 deg in top left and bottom right, then switching to five-sessions of training with 35±8 deg in top right and bottom left locations). Training at 65% accuracy of this task has been shown to yield learning with feedback but no learning without feedback (Liu, et al., 2010, 2012), while transfer to an orthogonal reference angle training with feedback yielded independent learning in the two training phases (Dosher & Lu …