A research team at the Massachusetts Institute of Technology has developed a device that can listen to and transcribe a person’s otherwise silent inner voice, to make that information available to record or transmit electronically–all without the user having to utter a word.

The device, called "AlterEgo" by its designers, makes use of a specialized headset that wraps around the back of the user’s ear, with an extension placed along the jawline. It picks up on neuromuscular signals transmitted through the jaw and face, an unconscious result of the internal verbalizations being made by the individual. These signals are then interpreted by a machine-learning system that translates the patterns into words.
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