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 tommy todd ointment robust 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 effects to small displacements across the thickness of the spokes that argan oil pure purple stimulated hard-wired motion detectors.