If something like this does come to exist, the easiest way to do it would probably be with electrodes attached to the skin around your vocal muscles. When we t

If something like this does come to exist, the easiest way to do it would probably be with electrodes attached to the skin around your vocal muscles. When we think in words, we make many of the muscle movements that that we make when speaking the same words. In fact, NASA has already implemented subvocal recognition and it's used for astronauts and fighter pilots. Unfortunately, placing the electrodes in the same exact place is difficult, and like regular speech recognition, error rates are still pretty high. It still has a lot of potential as a technology, though. http://en.wikipedia.org/wiki/Subvocal_recognition http://en.wikipedia.org/wiki/Subvocal_recognition