The experiment really rests on the following: What happens in the brain during something that's memorized and over-learned, and what happens in the brain during something that is spontaneously generated, or improvised, in a way that's matched motorically and in terms of lower-level sensory motor features?
O que acontece no cérebro durante algo  que é memorizado e sobre-aprendido, e o que acontece no cérebro durante algo gerado espontaneamente ou improvisado, de modo a ser combinado motoramente e em termos de características  do motor sensorial de baixo-nível?