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simplicio comments on Generalizing From One Example - Less Wrong
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"There was a wide spectrum of imaging ability, from about five percent of people with perfect eidetic imagery to three percent of people completely unable to form mental images."
Yesterday I was surprised to learn that my wife can barely see afterimages. I was watching a lecture where the green, yellow & black American flag appears, you stare at it, and then it goes away and an afterimage of the real red white & blue one appears. She couldn't see it after 4 tries. Then I told her to stare at a lightbulb for several seconds and look away. She still didn't see anything. Staring at it even longer produced a weak afterimage that she could only just barely see if she closed her eyes.
Whenever I wear polarized lenses I can see patterns in safety-glass, and more bands on rainbows than would regularly be there; most other people I've met are similar.
One day, on a long car trip, I was talking to the guy sitting next to me and he was able to see these things with his eyes uncovered. I haven't the faintest clue whether this is a hardware or a software difference, either seem feasible.
Related: ever seen Haidinger's brush?
It's very cool, but because it's on the threshold of perception it also requires a good deal of discipline not to fall into an N-ray style state of mind when attempting to view them.