In the first of three experiments, contrary to the separation of systems hypothesis, the induced motion perceived in a stationary central point of light was primarily (but not exclusively) determined by the movement of the outermost of two oppositely moving surrounds, regardless of surround shape. The second experiment found that moving square surrounds were more effective than moving circular surrounds in generating induced motion. In the final study, perceived motion of the stationary light was directly related to the size of the moving square surround. These results, which indicate that induced motion is a function of the relative position, shape, and size of the moving surround(s), may be due to changes in the observer's egocentric orientation and perception of straight ahead.
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