" Two participants with severe injuries to their cervical spine?the spinal cord at the level of the neck?were implanted with an array of 16 electrodes. Each implant was placed onto the spinal cord at the level of the injury and extended just above and below the injury. Participants practiced grasping and moving a handgrip while receiving varying levels of electrical pulses from the device. One person was tested daily over seven days while the other had weekly sessions for eight weeks.
In both individuals, hand strength improved over the course of a single session. With additional sessions, the accuracy and force the participants could generate gradually increased. The effects were maintained even in the absence of stimulation; by the end of the study, both individuals could generate more force without any stimulation than at the start of the study with stimulation."