The human brain anticipates unimportant sensations, such as your own touch, so it can focus on important input like, say, a tarantula crawling up your neck.

• 人脑能预感到一些不重要的感觉,比如自身的触摸,这样它就可以集中关注那些重要的外界刺激,比方说,有只狼蛛爬上了你的脖子。