Adaptation in the perception of rotary motion.

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Abstract
The effect of adaptation to a rotary pattern on speed ratings of the pattern was studied using a stimulus known to give a clear negative aftereffect of motion when tested on the stationary condition. A standard speed was presented for every rating. When test speed was the same or less than adaptation speed and in the same direction, test speed was rated less than control speed, consistent with Gibson's hypothesis that adaptation produces a negative shift along the subjective stimulus continuum. However, when test speed was greater than adaptation speed, then the test speed was rated relatively higher. When adaptation and test speeds were in opposite directions, the results were not as clear, but some aftereffects appeared also to be negative and some positive. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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