During the exercises, the therapist will press a switch to trigger a run of vagal nerve stimulation in time with the patient's activity. Patients will be videoed during the therapy sessions to allow researchers to retrospectively count the number and type of repetitive movements successfully performed. At the end of the exercises, the stimulator clip will be removed from the patient's ear and cleaned with an alcohol disinfectant wipe ready for next use. After each therapy session, patients will be asked to document on scale of 05 how much they experienced skin reddening, irritation, nausea, dizziness, and headache. Patients will be asked to rate their level of discomfort and fatigue arising from the session using a 05 scale.