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Colored afterimages

(Just a demonstration of colored afterimages, unconnected with my own research).

Gaze steadily at the central cross for 15 seconds. Now briefly move the mouse over the picture for one second, and you will see a colored afterimage in complementary colors.. Remove mouse and re-adapt ad lib, maintaining strict fixation. The subjective colors in the afterimage can become as strong as the real colors.

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