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the brain filters and creates a LOT - put someone in a dark room witha Very quiet noise... say a beeping- and then slowly turn the lights on as you fade the beeping out - they will SWEAR and really beleive that they still hear the beeping, even after you have secretly turned it off - the brain will compensate - thinking you can't sense the sound since the light is providing a flood of new visual stimulus-
i have no idea how much of our daily perfection is filtered out and replaced with a rough model of what we think we should be sensing.
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