Vection can be induced without explicit motion signal using backscroll illusion

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We demonstrated that vection is induced by a motion stimuli that does not have an explicit, bottom-up motion component. The stimulus motion used in this experiment was animation movie clips of walking people, with no positional changes within the stimulus field. There were no low-level motion signals in the direction of gait. The results indicate that strong vection was observed under optimal stimuli conditions, that is, large visual field and multiple walkers. These results suggest that vection can be elicited solely by motion signals extracted at relatively higher levels within the visual system. This is the first report that a pure high-level motion related to “implied motion” induces vection.

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