system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do people with amputated Appendages (Arms mainly) control prosthetics to the point where they have control of the prosthetic fingers? Awesome technology, seems it's only getting better, but was wondering how the connection is made when they attach the prosthetic like a glove.
gpt
A robotic neuroprosthetic (a prosthetic that you can move with your brain) works by implanting electrodes in the brain on specific locations where your brain will activate when you are trying to move the missing limb.

Your brain has a designated “motor centre”, where the signals to move come from.   When you move, your brain sends a message from this part of your brain down your spine to the nerves in the body part it wants you to move.   Those nerves activate your muscles, and they contract, which moves your body part.

When you lose your body part, you do not lose the accompanying part in your brain that was able to move that body part.   It’s like having a remote without the television.   

The prosthetic is attached in place of the natural limb, and the electrodes are attached to your brain.   These electrodes are able to sense your brain sending those messages.   The electrodes are activated by the brain’s messages, and the prosthetic moves.