Abstract

After rubbing a block of a different size, S s judged either the objective width of the test block or its felt width. With no preliminary information, judgments of objective and phenomenal width were equivalent. Judgments of objective but not of phenomenal width moved in the direction suggested by a truthful verbal briefing. (Prior practice with a visual display, the Mueller-Lyer arrowhead illusion presented as an analogy to the kinesthetic aftereffect task, proved to be ineffective.) Misinformation did not alter subsequent judgments. In no case was the measured aftereffect abolished or reversed. It is suggested that knowledge about the task modifies judgments rather than sensory experience.

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