I've often wondered about this. I did some machine vision for robotics work years ago. Coping with motion induced blur is quite a problem. Interesting to see how the brain suppresses motion artifacts.
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Now I understand why blurring is often reported in psychedelic experiences. Might be this control mechanism being shut down
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The cortex is remotely involved but the inhibition occurs between superficial and deep layers of the Superior Collicus, so the phenomenon applies to invertebrates only, last half billion years or so. :)
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Whoops. I meant to write *vertebrates, of course, not invertebrates!
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This also happens when we blink. So we don’t see the world dim then brighten - but we do when a light bulb flickers.
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Idk if it’s just me (probably not :P), but while I cannot make any blur while moving my eyes in a straight line back and fort between two points, I can still create blur if I roll my eyes in circle.
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There's a hack to see the blur (and other hidden masking functions of the brain) >> close your eyelid but force it open with a finger and move the eye around. Brain still registers the lid as "closed" and doesn't apply the masking or micromovement.
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