Andrew Huberman· PhD
however when I was in college at the time there were these little epinephrine pills that were common in a lot of sports supplements these are like pre-workout type things yes not unlike energy drinks now which I completely avoid — and I had this experience of taking one of these and drinking some coffee and of course it gave me a lift in energy these are very similar to amphetamine they were legal over the counter at the time they're now either banned or illegal I do not recommend them and I had a lot of energy but what I noticed is that my grunting tick came back and I had I made one mistake I still think of this as one mistake which was um I engage in a superstitious Behavior I knocked on wood and then somehow it felt very rewarding like it gave me some totally irrational but internally rational sense of of security around I forget what I was knocking on wood about and I found that I couldn't break that knock on wood compulsion I felt I needed to knock on wood and so then I started sneaking knock on wood like in mid-exam and studying and pretty soon I was knocking on wood often I developed a superstition