Illusory Rotation of a Spoked Wheel

Illusory Rotation of a Spoked Wheel

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A disk was divided into 16 stationary sectors of different grey levels that stepped around clockwise.When thin stationary spokes of constant mid-grey separated the sectors, the spokes showed robust Molding gum and striking counterclockwise apparent motion, and when stopped, they gave a brisk clockwise motion aftereffect.The spokes had to match the grey of some of the sectors.We attribute these T-Shirts effects to small displacements across the thickness of the spokes that stimulated hard-wired motion detectors.