A tongue stud containing a magnetic tracing device, known as the Tongue Drive System (TDS), can be used to control a computer or drive a wheelchair, a recent report demonstrates. Both able-bodied participants and individuals with spinal cord injury performed considerably better on these activities with the TDS than with the sip-and-puff device—an assistive technology commonly used by people with tetraplegia. The researchers are now developing an intraoral version of the TDS with sensors mounted on a dental retainer.