Isn't it already sort of scientifically proven that "if you don't use it, you lose it" wrt to the brain? In that case, the validity of the 'exercise model' foll

Isn't it already sort of scientifically proven that "if you don't use it, you lose it" wrt to the brain? In that case, the validity of the 'exercise model' follows from that, at least for 'maintenance' mode (what the article seems to be arguing for). Now for hypertrophy (actually "becoming smarter"?), the question may still be open...