The Audeo is essentially a EMG sensor placed over the larynx. The acquired
EMG signals are translated via algorithms into commands to retrieve
pre-stored phrases for AAC, to scan through mouse motions for computer
access, or to drive a wheelchair 

"The Audeo is being developed to create a human-computer interface for
communication without the need of physical motor control or speech
production. Using signal processing, unpronounced speech representing the
thought of the mind can be translated from intercepted neurological signals."  

"By interfacing near the source of vocal production, the Audeo has the
potential to restore communication to people who are unable to speak. The
proposed solution is a featherweight wireless device resting over the vocal
cords capable of transmitting neurological information from the brain. Using
data analysis, this information can be processed into synthesized speech or a
menu selection capable of conveying the basic necessities of human life."  

Audeo
http://www.theaudeo.com/