Sometimes other people tickle our armpits and even laugh, but they scratch themselves but they don't feel so strongly. Why?
First of all, we need to know why scratching the armpit itches and why it makes us laugh when we feel it. Many scientists believe that scratching the armpit is a kind of gentle touch to the skin. The brain feels as if there is some danger coming, such as 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 scratching your own armpits? This is because when you scratch yourself, you are mentally prepared. That is to say, when your brain sends out instructions to your fingers, it also sends out a signal that there will be no danger when you are touched. Since I knew there was no danger, my nerves would not be nervous, and of course I would not laugh.