VNS-Induced Corticospinal Plasticity

Eligibility Details: Inclusion Criteria: INDIVIDUALS WHO HAVE HAD A STROKE: 1. Diagnosis of first ever stroke 2. At least 6 months after stroke onset 3. Motor-evoked potentials in hand/arm muscles 4. Subjects must show an understanding of the study goals and have the ability to follow simple directions as judged by the investigators. ALL INDIVIDUALS: 5. Between the ages of 18 and 75 years old Exclusion Criteria: INDIVIDUALS WHO HAVE HAD A STROKE: 1. Hemispatial neglect, aphasia, or cognitive impairment that would impact testing and would interfere with the ability to follow simple instructions, as judged by the investigators ALL INDIVIDUALS: 2. Neurological disorder(s) influencing movement (besides stroke) 3. History of seizure or epilepsy 4. Metallic brain implants 5. Bodily implants such as cardioverter defibrillators, insulin pumps, ventriculoperitoneal shunts, cochlear implants, or pacemakers 6. Pregnant or expecting to become pregnant 7. Difficulty maintaining alertness and/or remaining still 8. Silicone or plastic allergy 9. History of vestibular disorders (eg, Vertigo, Meniere's Disease, etc.)