I think this concept has existed for quite some time. Musicians and athletes and dancers have always known about muscle memory. But whether those memories exist

I think this concept has existed for quite some time. Musicians and athletes and dancers have always known about muscle memory. But whether those memories existed in the appendages or in the brain was never well known. I think this gives more credit to the idea that some memories are actually stored in the Peripheral Nervous System. As a thought experiment, lets say a famous guitarist loses an arm and gets a perfect transplant or a prosthetic which perfectly matches their previous dexterity. Would it perform as well as their old hand, or was the hand performing additional calculations on incoming and outgoing data that could never fully be replicated by a replacement. Now take it a step further and assume a random person receives a famous guitarists arm in a perfect transplant. That arm is an instrument in itself with its stored knowledge, but that doesn't mean the receiving brain knows how to communicate effectively with it. I'm sure they would have basic communication, but the extended neural vocabulary of the old Brain-hand pair would be known to the new host-brain. Personally, I believe it is a tandem effort between CNS and PNS in which each becomes accustomed to the signals sent by the other. For example: A brain tells a finger to curl HARD, the finger neurons receive the brains input, modulates it with local factors, and sends it to the muscle. Likewise, the finger knows the feel of the strings exceptionally well, and can send highly detailed messages back to the brain who is used to receiving highly detailed messages. But in the new host who doesn't know this advanced feeling, it just feels like a regular old input.