Added 6 minutes later
Well, the fact that biochemical processes are responsible for feelings, mental state, etc. is undeniable. By the way, here are two (questions like these should be punishable by death in intellectual games, as far as I'm concerned ^^): 1. Vasily goes to work in the morning by elevator, from the seventeenth floor to the first. When he returns from work, he walks up the stairs to the seventeenth floor. Why does he do that? 2. Let's take the same Vasily, although these questions have nothing to do with each other: Vasily comes home from work and is going to go to bed. Looking at his watch, he realizes that someone is in the apartment. Anticipating your questions: the watch is analog, without an alarm, guess the other details yourself.