Scientists have developed a novel headset that makes it possible for a person suffering from spinal cord injury to precisely control a wheelchair or computer using the tongue.
The "tongue drive", being trialled at Georgia Tech University, Atlanta, could also give astronauts a third hand in difficult situations like spacewalks.Invented by Electrical Engineer Maysam Ghovanloo and Xueliang Huo, the device works by using two sensors to track a 5-millimetre-wide magnet attached to the tip of the user's tongue. The magnet is attached to a person's tongue using surgical adhesive.The sensors — implanted in a wireless headset — accept fluctuations in the strength of the magnetic field as the tongue moves, and transmit the signals on to a computer, where they are interpreted and acted upon.By moving the tongue in predefined patterns, the user can steer a cursor on a screen, direct a wheelchair, and can even on switch on a TV.Conventional methods include "sip and puff" devices, which are operated by blowing or sucking on a straw held in front of the mouth.However, according to the Ghovanloo, tongue-drive system can accept a wider variety of commands."Some don't like their sip and puff because it sits right in front of their face, and is like a signal of their disability," New Scientist magazine quoted Ghovanloo as saying."Our design can be made less conspicuous," Ghovanloo added.The researchers say that they are in talks with a dental expert about installing them into a plastic retainer that fits inside the user's teeth.