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2. Seeing: Hacks 13–33 > 27. Show Motion Without Anything Moving

Show Motion Without Anything Moving

Find out why static pictures can make up a moving image on your TV screen.

The motion aftereffect [See Movement When All Is Still] shows that motion is computed in your brain separately from location. For instance, becoming accustomed to the moving surface of a waterfall causes you to see stationary surfaces as moving the other way, although they’re quite still. In theory, motion can be calculated from position and time information, but that’s not how your brain does it—there’s a specialized brain region for detecting motion directly. Since location and motion are perceived separately, this can lead to some odd illusions, the motion aftereffect chief among them: you get the illusion of motion without anything actually changing position.


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