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A Change of Heart

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Description
Opponent-process cells that switch on or off in response to green send an opposite message—“red”—when the green is removed, producing a negative afterimage. Stare at the black dot in the middle of this heart for at least 20 seconds. Then shift your gaze to a white piece of paper or a white wall. Do you get a “change of heart”? You should see an image of a red or pinkish heart with a blue border.
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