Local Motion Aftereffect is Not Enhanced by Adaptation to Global Motion

Abstract

The existence of top-down modulation from global- to local-motion mechanisms is examined by using motion-aftereffect (MAE) with four-patch pseudo-gabor stimuli containing either global (translation and rotation) or local (single patch) motion. MAE durations were measured with a stationary gabor test patch whose position coincided with one of the adaptation patches. The duration was almost equal between the three conditions. These results indicate that there is little top-down interaction from global- to local-motion mechanisms, and suggest that the flow of motion information is mainly bottom-up as long as MAE strength is concerned.