For example, you’re learning a piece of music on the piano, there’s a difficult trill, and each time as you approach it, you think, “Here it comes. Remember, tuck my elbow in, lead with my thumb.” A classic working-memory task. And then one day you realize that you’re five measures past the trill, it went fine, and you didn’t have to think about it. And that’s when doing the trill is transferred from the frontal cortex to more reflexive brain regions (e.g., the cerebellum). This transition to automaticity also happens when you get good at a sport, when metaphorically your body knows what to do
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