I tend to agree with GregJwillis somewhat

However Ifirmly beleive and have witnessed this firsthand by myself, in order to play your best golf, and this can even be effective in practice, you have to let your subconscious take over. When you stand over the ball you should think of nothing, or if it helps think of one swing que, do your best to not make it mechanical. When I refer to the subconscious, I am also referring to being in the zone letting your subconscious take over, this will also enhance focus.