Question

Why can't we tickle ourself?

Answer 1

Answer:

Further studies using robots showed that the presence of a small delay between your own movement and the resulting tickle can make the sensation feel tickly," Blakemore told Scientific American. ... The reason you can't tickle yourself is because your brain is actually too active for that happen

Answer 2

At some point, every kid has learned this cold, hard fact of life:

it's impossible to tickle yourself.

But why?

As the Brain Bank explains, the simple answer is that you're already expecting the sensation, so you're less likely to react as you would if being tickle tortured by a big brother or a devious friend.