I just gave a private lesson to a couple brothers, ages 9 and 15, who live with their younger sister and parents in Moscow most of the year (the father works in the oil business there). During the lesson I drilled 7-8 medium-long shots and asked them to notice how focused I was.

When learning any new skill, it's very valuable to slow it down to learn more deeply. When you go to learn any new motion, especially a complicated motion like a golf swing, it's helpful to slow it down and also keep it small and in close. I am not versed in learning theory of how, technically, the body, brain and nervous system receive and process stimuli. I just know that if I slow it down, I learn it quicker. It just works that way.