How does prosthetic arms know how/when to move its fingers?

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Is it detecting tiny electric signal from the amputated arm? How does that work?

And how does it feel moving a non-biological arm? Or do the brain eventually adjust and accept the prosthetic as a part of our body?

In: Biology

That’s an entire 300-level college course, right there, but the basic answer is electronics and black sorcery in coding.

The prosthetic uses special sensors that read electrical signals from nerves or brain neurons, and turns them into signals that run the prosthetic limb. The brain doesn’t get feedback from the arm, but it does eventually adapt to moving it. Kinda like moving your hand if it’s completely numb.

The prosthesis uses a small voltmeter with high gain amplification to measure the electric impluse in the surface muscles.