THE EFFECTS OF DISPLACEMENT SIZE AND FRAME DURATION ON THE MOTION-INCOHERENCE AFTEREFFECT

After motion adaptation, the perception of global movement direction i n partially coherent random-dot kinematograms (RDKs) is temporarily im paired if the predominant direction of dots in the test stimulus match es that of the adaptation stimulus. The dependence of this motion-inco herence aftereffect on stimulus characteristics (displacement size and frame duration) of the RDKs used to produce and measure it were exami ned. In addition, the speed selectivity of the aftereffect was investi gated. The results indicate that the motion-incoherence aftereffect de pends on frame duration, not displacement size, and that it is coarsel y velocity selective.