I read that Stephen Hawking used some kind of infrared sensor on his glasses that sensed his cheek muscle moving which would then speak though a voice synthesizer, but how did that work? How would the computer know which word he was trying to type/speak if he could only move his cheek muscle?
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A lot of people have already covered the methods he used, but you should also know that pretty much any time he was interviewed he was given the questions well in advance, that way he could have time to prepare his answers and just have them queued up for the interview. Otherwise having a conversation with him was pretty slow as he had to type up his responses pretty slowly.
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