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Trial sequence. Each trial began when a moving Gabor patch was presented in the periphery (example stimulus has a physical motion path that is orthogonal relative to the upper right diagonal with a possible counterclockwise perceived motion path due to the internal drift). The Gabor was presented for 2 s and then disappeared. Participants were asked to adjust the response bar at fixation until it was parallel to the perceived motion path of the Gabor path.
