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Physics Student,

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The actual plausibility of translating information from the brain to, say, a hand

I am currently an undergraduate college student, and I've had this idea building in my head for about two years now. Signals from the brain to the muscles are transmitted through electro-chemical signals, right? I am wondering the plausibility of translating those signals into a language a computer can understand. Not in a simply way either, but rather as thoroughly as can be managed. The reason I want to know this is because essentially, if we can understand the signals that the brain gives to the muscles, we can begin to create prosthetics, among other things, that are entirely thought controlled. Although the use for amputees would be immense, going a step further it could be used for something practical. We could replace use nerve signals being sent to appendages that have become outdated (pinky toe), and allow a device of some sort be able to read the same signals being used to wiggle your two to make use of a device. Even if all it would be in that specific case is an off and on button, it is still something I think can be of use.