You cannot tickle yourself — your brain predicts the touch
When you try to tickle yourself, the cerebellum and related circuits forecast the sensation and dial down the surprise. Same touch from someone else arrives unpredicted — and feels ticklish.
That self-generated prediction is part of how the brain tags “I did that” versus “something happened to me,” keeping the world from feeling like constant self-noise.
Tickle science is sensorimotor honesty. Your mind cancels expected feedback so novel contact can still grab attention.
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