This study will look at the differences in improvement of hand and arm function when nerve stimulation is applied at different times in relation to motor training. The nerve stimulation, called peripheral nerve stimulation (PNS), is non-invasive and painless. Subjects in the study may receive strong or mild PNS. Subjects will also vary by whether PNS is delivered for 2 hours before the 2 hours of motor training, or during the 2 hours of motor training. Which level of stimulation and its timing will be determined randomly for each subject.
Subjects will receive non-invasive stimulation of nerves on their arm and intensive motor training of their arm. The timing of the stimulation in relation to the training will vary by group.