原文：I learned that the reason we can't tickle ourselves is that your brain predicts the sensation and cancels it out, which basically means my brain is working against me when I'm trying to have fun.
译文：人为什么不能自己挠自己痒痒，因为大脑会提前预判然后直接屏蔽掉这个感觉，说白了就是我想自娱自乐的时候大脑在给我使绊子。
