This sort of advance is becoming more commonplace. "The researchers implanted four microelectrode arrays manufactured by Blackrock Neurotech that recorded neural activity in areas of the brain associated with language and speech, using 256 intracortical electrodes... by the second day of use, the patient was communicating using a 125,000-word vocabulary, according to the study." What's significant here is that the machine isn't recording 'thoughts', but rather, articulations of those thoughts using what might be called our 'inner voice'. So it's more like speaking through an internal microphone that it is having a machine sift through your brain to figure out what you're trying to say.
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