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tickleBOTTOM LINE: Why Can’t You Tickle Yourself? Because you know it’s coming when you do it and when someone else does, it’s a surprise.

Your cerebellum can predict sensations when your own movement causes them but not when someone else does. When you try to tickle yourself, the cerebellum predicts the sensation and this prediction is used to cancel the response of other brain areas to the tickle.

— Various Sources

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