Sekuler and Ganz (1963) called the difference in luminance threshold for movement in the same direction versus movement in the opposite direction to the adapting motion ‘direction-specific adaptation’ (DSA). The experiments reported here investigate colour-contingent DSA.
After exposure of subjects to clockwise motion of a red pattern alternating with counterclockwise motion of a green pattern, their threshold for clockwise motion was found to be greater than for counterclockwise motion when the illumination was red, but lower when the illumination was green.
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