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Why you cannot tickle yourself: your brain is basically pre-canceling the

Why can't you tickle yourself? Your brain uses an efference-copy preview of your own move to pre-cancel the touch, so it lands weaker than a surprise touch[2]. Add a tiny delay and the tickle gets stronger[1].

  • Who doesn’t love a tickle;e fight? Image credit Dominic Casario via Flickr
  • Human brain mri scan interface