Adaptation in the perception of visual velocity.

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Abstract
The effect of adaptation to an orbitally rotating pattern on a subsequently presented moving test stimulus was assessed using a procedure in which S is unaware of the occurrence of aftereffect. When adaptation and test motions were in the same direction, results were generally consistent with already known aftereffects of the waterfall-illusion type. But little or no aftereffect occurred when adaptation and test motions were in opposite directions. This finding agrees neither with Adaptation Level theory nor with Gibson''s principle of negative aftereffect. It may, however, be related to the recent discovery of retinal units which are differentially sensitive to the direction of stimulus movement.