In "The Talent Code," the author makes this statement:
What's the simplest way to diminish the skills of a superstar talent? The answer: don't let them practice for a month. Causing skill to evaporate...only requires that you stop a skilled person from systematically firing his or her circuit [and continuing to grow myelin] for a mere thirty days.
However, later in the book there is this statement:
Myelin wraps—it doesn't unwrap. Like a highway-paving machine, myelination happens in one direction. Once a skill circuit is insulated, you can't un-insulate it (except through age or disease).
Assuming these are both true, how do they coexist? If a neural circuit is not getting un-insulated in a month of no practice, why can't the performer resume at their previous level of skill?