I'm not sure if this specific question has been already covered. If a person in his 60s who had been say, a painter all his life, decides to instead learn to play an instrument, what happens to the neural processes in his brain? Will the brain use brand-new neurons to create a brand new behavior? Are there ever neurons "waiting around for" or "being made when" a new behavior or brain process comes around? And the neurons that were firing the actions specifically for painting, will they just "sit around" waiting to be fired in case painting every gets engaged again? That is my understanding, that they might fade slowly, gaining atrophy, but not really "disappear". If they are not really used anymore, might they start being recruited for the new instrument playing, or some other new or old action?