screen saver

n. (from mycophile usage)

  1. The phenomenon of visual phantoms resulting from a high-focus activity.

And then there was the “screen saver”—the fact that after several hours interrogating the ground for little brown dunce caps, ther images will be burned on your retinas. “You’ll see. When you get into bed tonight,” Ben said, “you’ll shut your eyes and there they’ll be again—wall-to-wall morels.” —Michael Pollan, The Omnivore’s Dilemma

As mushroom hunting is such a focused task, this may be related to the dreaming Tetris phenomenon and more learning the task than simply the repetition.

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