Gervase is staring at the blades of his ceiling fan.When he turns off the fan,he is surprised that the blades appear to be rotating in the opposite direction.To reassure Gervase that he is not hallucinating,you could tell him about

Question

Quizplus · Accepted Answer

Motion aftereffects occur when viewing a moving object for a period of time and then looking at a stationary scene, causing the stationary scene to appear to move in the opposite direction. This explains why the fan blades seem to rotate in the opposite direction after being turned off.

Gervase Is Staring at the Blades of His Ceiling Fan