Velocity tuning of the motion aftereffect with flickering test stimuli

Abstract

Temporal tuning of the motion aftereffect (MAE) with flickering test stimuli was examined. Using sinusoidal gratings of several spatial frequencies (SF), the MAE strength was measured for various adapting temporal frequency (TF). Plotted as a function of TF, the peak varied with conditions. However, when plotted as a function of velocity, each line showed a similar reversed U-shaped function with the peak at approximately 5-8 degree. This result differs from the TF dependency of traditional static MAE, showing a discrepancy between the two MAEs. The MAE with flickering test might reflect the higher levels of processing underlying motion perception, in contrast with relatively lower levels underlying the traditional MAE.<>