Why can not we tickle our own body?

Somo able to tickle our own body?!?! People are unable to tickle the body (purposely) because the brain provides their movements before they happen, excluding the sense of danger and panic that causes the tickling. When someone pokes, the body reacts by becoming tense. Even when we touch the body, he shows no reaction. Some people never touch the contract by the other and therefore do not feel ticklish. Results of research conducted by a group of scientists from the University of London indicates that the cerebellum is responsible for monitoring the movements, preventing the reaction.