Perception at the blind spot and tilt aftereffect.

Black and white stripes were used to induce a tilt aftereffect near the blind spot. Stripe fragments on either side of the blind spot were seen as being completed across the blind spot, but the magnitude of the tilt aftereffect they induced suggested that the perceptually "filled-in" portions of the stripes did not contribute to the aftereffect. So perceptually filled-in lines seem not to be fully potent percepts.