Augmented and Delayed Feedback in the Chevreul Pendulum Illusion

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Abstract
Two experiments were performed with male and female college students to determine the effects of augmented and delayed feedback on the Chevreul pendulum effect: the tendency of a small pendulum, when suspended from the hand and imaginatively concentrated on, to oscillate seemingly of its own accord. Using a time exposure photographic measurement technique and an electronically monitored pendulum, visual and auditory analog feedback was presented to Ss during imaginal processing tasks. It was found in Experiment I (N = 14) that both visual and auditory analog feedback facilitated the pendulum effect, although not as extensively as normal visual feedback. In Experiment II (N = 30) it was found that delayed visual analog feedback disrupted performance with the pendulum but that delayed auditory analog feedback did not. The reliable within-Ss results established the pendulum effect as a skilled behavior which can be investigated like other sensory motor skills.

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