Mind-controlled prosthetic limbs are going to be come a thing. They will be able to make life easier for a lot of people. Physicians and biomedical engineers from Johns Hopkins have recently demonstrated a mind-controlled prosthetic arm that supports individual finger movements. An array of 128 electrode sensors was used to collect data from the brain. The prosthetic arm moves fingers based on electrical activity in the brain.
The system is not perfect but it does seem to have a high % of accuracy. You can find out more on the Journal of Neural Engineering.
[Credit: Courtesy of the Journal of Neural Engineering] [H/T]