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An illusion of passive movement arising from the perception of motion in the surrounding environment, as when a person sitting in a stationary train sees another train on an adjacent track begin to move and experiences an illusory sensation of being moved in the opposite direction. The phenomenon was first identified and studied quantitatively in 1929 by the German psychologist Karl Duncker (1903–40). Also called induced motion. See also audiogyral illusion. Compare apparent movement. [From Latin vector a bearer or carrier, from vehere, vectum to convey + -ion indicating an action, process, or state]

Subjects: Psychology.

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