Tickling is the light touch of another person to make an involuntary laugh or "flinching". Anyone who has ever tried to tickle their own knows what happens - you do not have to laugh. Even the most ticklish man can not tickle himself. But why is it like that? Why do not we have to laugh when we try to tickle ourselves? Neurologists believe that they have now come to the puzzle. Our brains have to make sure that little or nothing comes into our consciousness from the abundance of information that constantly streams into our senses, unimportant stimuli. Only then is it guaranteed that it can focus on the real stimuli - the brain creates a so-called priority list.
Sensory impressions of others take precedence Sensory impressions that others generate for us - stimuli that come from outside - are at the top of this priority list. These include touches caused by foreign objects, animals or persons as well as visual and acoustic signals. These bring new information to our brain. Sensory impressions that we create ourselves are at the bottom of our priority list. This includes the touch by your own hand. These stimuli do not provide our brain with any new information.
Our brain reacts immediately People can not tickle themselves, because the brain already knows when and where a touch takes place. The brain calculates the time of contact when it touches it. Then at the calculated time, it attenuates all the nerve signals that are emitted by the affected part of the body. The fact is that tickling is only perceived as ticklish when another touches us. This is due to the surprise effect that triggers the foreign contact with us. Surprising touches put us on alert and trigger in our defense reactions. If we are tickled, this is a warning signal for the body. Tickling ourselves, there is no reason for the body to sound the alarm.