writes "Newscientist has an interesting article on tapping the nerve impulses going from the brain to the vocal chords, allowing for 'Voiceless' phone calls, as seen in the video.
With careful training a person can send nerve signals to their vocal cords without making a sound. These signals are picked up by the neckband and relayed wirelessly to a computer that converts them into words spoken by a computerised voice. It's not quite telepathy, but it's pretty close."Link to Original Source