Abstract
An experiment was designed to investigate a method claimed (Ikeda & Obonai, 1955) to demonstrate a necessary relationship between visual illusions and figural aftereffects. The experiment indicated that the report of an apparently smooth transition, from illusion to aftereffect, is misleading. Rather, the method sets up competing judgments in the region between simultaneous and successive conditions of presentation; the outcome being a replacement of the illusion by the aftereffect.

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