Unused neural signals from the brain could hold the key.
, which detects electrical signals sent by hundreds of spinal neurons that are received by skeletal muscles., the researchers created a training module that receives EMG signals produced by a user performing small muscle contractions. The module then determines what pulses of motor neurons — nerve cells that deliver signals that tell a muscle to move — comprise the EMG signals.
Nevertheless, that alone doesn't necessarily free up your muscles' direct involvement when controlling a robotic limb. The researchers soon discovered, however, that higher frequencies in motor neurons appeared to be essentially unused, and only lower frequencies appeared to be responsible for actual muscle control.
Once again, they directed users to perform small contractions, and the researchers separated the resulting frequencies in the neurons into one low band and another high band, and cleverly linked these discrete bands to horizontal and vertical cursor movement.
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