ANOTHER MEANS FOR MEASURING THE MOTION AFTEREFFECT

A new procedure for measuring the motion aftereffect (MAE) is describe d. The procedure involves adaptation to an animation sequence depictin g dots moving in a given direction followed by presentation of a test sequence depicting dots moving in all possible directions. Under adapt ation, the test sequence appears to have a directional bias opposite t he direction experienced during adaptation. This MAE can be nullified by viewing an animation sequence in which a percentage of dots is cons trained to move in a direction opposite the aftereffect. Using a metho d of constant stimuli, this percentage can be varied to find the value yielding incoherent motion. This dynamic MAE exhibits the same charac teristics as the conventional MAE.