Illusory Rotation of a Spoked Wheel

Illusory Rotation of a Spoked Wheel

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A disk was divided into 16 stationary sectors The Arizona Pant of different grey levels that stepped around clockwise.When thin stationary spokes of constant mid-grey separated the sectors, the spokes showed robust and striking counterclockwise apparent motion, and when stopped, they gave a brisk clockwise motion aftereffect.The Double clip spokes had to match the grey of some of the sectors.

We attribute these effects to small displacements across the thickness of the spokes that stimulated hard-wired motion detectors.