AlterEgo is a wearable silent speech output-input device developed by MIT Media Lab.
[1] The device is attached around the head, neck, and jawline and translates your brain speech center impulse input into words on a computer, without vocalization.
[2] The device consists of 7 small electrodes that attach at various points around the jaw-line and mouth to receive the electrical inputs to the muscles used for speech.
[5] In 2018, the device was presented at the Conference on Intelligent User Interfaces where the research team reported a 92% median word accuracy rate.
[6][7] Scientists Arnav Kapur of Fluid Interfaces group at MIT Media Lab with Shreyas Kapur and Pattie Maes designed the prototype and presented the work at the Conference on Intelligent User Interfaces in March 2018, in Tokyo.