This is pretty impressive. "Today, in the journal Nature, scientists at the University of California, San Francisco, present a new type of brain-computer implant (BCI), powered by neural networks, that might enable individuals with paralysis or stroke to communicate at the speed of natural speech—an average of 150 words per minute." Instead of 'reading thoughts' and trying to infer linguistic representations, it instead "it translates brain signals into movements of the vocal tract, including the jaw, larynx, lips, and tongue." These movements are then translated into speech. The approach requires electrodes implanted directly in or on the brain; "external electrodes simply cannot provide precise enough data from small brain regions, experts agree."
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