> because of limitations in the part of the brain that controls the muscles of the mouth That makes it sound like it might be feasible to "fix" this. Maybe by

> because of limitations in the part of the brain that controls the muscles of the mouth That makes it sound like it might be feasible to "fix" this. Maybe by implanting electrodes to stimulate these specific muscles and have the electrodes controlled by unrelated moto-neurons (or maybe capture the sign language and apply the correct stimulus). How far are we from this, are there any research team working on this? Is it ethical to do it? Is it ethical not to do it if we have the means?