I too, once wondered this question & have
since then, done some research on it. As
surprising as this may come to you, the reason
you laugh/giggle when tickled is because you &
your body are in a state of panic. When
somebody tickles you & you laugh & squirm,
although you may not realise it, your body is
actually in a state of panic & doesn't know
what to do. The reason you squirm is because
your body is trying to escape from whatever is
tickling it, not knowing whether or not it's going
to come to any harm. As for the laughing/
giggling, you may not know this, but your
nerves that feel the sensation of tickling are
also your nerves that feel the sensation of pain
(this next part may be a little confusing to
explain, so here goes). Since soft touches
don't hurt you but they still tickle, your body &
nerves become confused & can't tell whether
or not you are in any real danger, even if you
consciously know you're only in a playful tickle-
fight, for example. Therefore, your body
doesn't know whether to laugh or scream, so
you kinda end up doing both, depending on how
ticklish you are.
As for me, I don't usually start screaming
unless the tickling becomes very unbarable,
which is rare for me as I LOVE BEING TICKLED,
LOL!
I hope I've helped you. I'm confused myself
now, LOL!
it is funny alot
