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Color and luminance share a common motion pathway.

Determined, in 5 experiments in which the authors and a naive S served as observers, that following exposure to a moving grating of bars differing only in luminance, a motion aftereffect (MAE) is observed on a stationary grating of bars differing only in chrominance. This suggests that the motion of equiluminous chromatic stimuli is sensed by a channel that responds to both luminance and chrominance and not by a separate channel specialized for the motion of colored stimuli. However, adding color to a low contrast luminance stimulus reduced its effectiveness at creating or nulling an MAE, indicating that the response of the motion pathway to color is qualitatively different from its response to luminance. A chromatic stimulus demonstrated a dissociation between perceived speed, MAE speed, and speed required to null the MAE that was absent for a luminance stimulus. Data suggest that color and luminance share a common motion pathway to which color has only a weak input. (23 ref) (PsycINFO Database Record (c) 2007 APA, all rights reserved)