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Q: Why Can’t You Tickle Yourself?

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A: Much to the dismay of wacky masochists everywhere, the human brain is wired against self-tickling. Because the brain controls movement, it knows what your hand is going to do before you do it. Thus, it anticipates the exact force, location, and speed of the tickle and uses that information to desensitize you to your own roving hands.

So why do we have a tickle response anyway? Turns out, it’s a defense reaction meant to alert our cave-dwelling ancestors to creepy crawlies that didn’t know their place, and the uncontrollable laughing fit that goes along with it is actually a panic response. Even if you know someone else is about to go for your rib cage, it’s hard to turn the responses off because a) your brain can’t anticipate exactly how and where they’ll tickle you, and b) knowing someone is about to tickle you is usually enough to keep those panic receptors open and ready to go.

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  • MAOZ

    The BC headline (at the top of their home page) characterized the question as “Auto-tickling?” So here I thought it had something to do with getting your Chevy to laugh!

  • http://www.mentalfloss.com Will from mental_floss

    nope, but good idea for another question of the day!

  • http://www.futonreport.net/ Matthew T. Sussman

    If Mental_Floss was some kind of bully, the article may be “Q: Why Can’t You Stop Hitting Yourself? Why Can’t You Stop Hitting Yourself?”

  • http://www.gpb-katie.blogspot.com Katie McNeill

    I didn’t know that. cool.