Regardless of whether your mouth is moving right now, you are talking to yourself.
As you read these words, the muscles in your larynx, jaw and face are fluttering with quick, imperceptible movements, sounding out the words so you can actually "hear" them in your head. This kind of silent speech is called "subvocalization," and unless you're a speed-reader who has trained yourself out of this habit, you're doing it all day, every time you read or even imagine a word.
Now, MIT researchers want to use those subvocalizations to decode your internal monologue and translate it into digital commands, using a wearable "augmented intelligence" headset called AlterEgo.