The revolution is built on three simple facts. (1) Every human movement, thought, or feeling is a precisely timed electric signal traveling through a chain of neurons—a circuit of nerve fibers. (2) Myelin is the insulation that wraps these nerve fibers and increases signal strength, speed, and accuracy. (3) The more we fire a particular circuit, the more myelin optimizes that circuit, and the stronger, faster, and more fluent our movements and thoughts become.
Why is targeted, mistake-focused practice so effective? A: Because the best way to build a good circuit is to fire it, attend to mistakes, then fire it again, over and over. Struggle is not an option: it's a biological requirement.
These two insights—skills as brain circuits and automaticity—create a paradoxical combination:
we're forever building vast, intricate circuits, and we're simultaneously forgetting that we built them.