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The course of adaptation to prism was examined by recording S's localization of (a) an object which was objectively straight ahead and (b) straight ahead. It was found that, as the object of regard changed in apparent position and came to be localized correctly, straight ahead changed concomitantly with it. Mean data for 20 Ss with a 25 diopter prism showed that, of the total change in localization during adaptation to the prism, 71% resulted from a concomitant change in the test stimulus and straight ahead, while only 29% could be attributed to a reduction in the disparity between the test stimulus and straight ahead.