Sihai network

Why does oneself scratch creaky nest won't itch?

Sometimes others tickle our armpits and even laugh, but we don't feel so strong when we scratch ourselves. Why?

First of all, we need to know why scratching the armpit itches, and why we laugh after tickling? Many scientists believe that tickling the armpit is a gentle touch on the skin. The brain feels as if there is a danger coming, for example, a poisonous bug or a poisonous snake crawling on the skin. Once found that is not the case, the brain instant reflective fear disappeared, and then rest assured, subconsciously laugh. The more severe the scratch, the stronger the fear. After the fear, the stronger the smile.

So why don't you feel itchy when you scratch your armpit? It's because when you scratch yourself, you're mentally prepared. That is to say, the brain sends out a signal that there's no danger when you're stroking your fingers. Since we knew there was no danger, our nerves would not be nervous, and of course, we would not laugh.