Brain-Machine Interface Isn’t Sci-Fi Anymore

The text on the screen is being generated not by his fingertips, but rather by the signals his brain is sending to his fingers. The armband is intercepting those signals, interpreting them correctly, and relaying the output to the computer, just as a keyboard would have.

Steven Levy

https://www.wired.com/story/brain-machine-interface-isnt-sci-fi-anymore/