MOTION AFTEREFFECT WITH FLICKERING TEST STIMULI DEPENDS ON ADAPTING VELOCITY

Temporal tuning property of motion aftereffect (MAE) with flickering t est stimuli (flicker MAE) was examined. Using sinusoidal gratings of s everal spatial frequencies (SF), MAE strength was measured for various adapting temporal frequencies (TF). Unlike the traditional MAE with s tatic test field, the results indicated that flicker MAE did not depen d on TF. Rather, when plotted as a function of velocity, the peaks had approximately the same adapting velocity of 5-8 deg/sec for all SF co nditions tested, suggesting velocity dependence. This is further suppo rt of the idea that the two kinds of MAE are of different origin and s uggests a higher origin of flicker MAE, perhaps in the area MT or MST.