PoNS Clinical Experience Program (TBI)

\- Brief Summary: Prospective, cohort, open-label study. The cohort consists of people who have a chronic balance dysfunction due to a mild to moderate traumatic brain injury (TBI). All participants will participate in a 14-week PoNS Treatment protocol - a combination of symptom specific physical exercises and repeated use of the PoNS device. Subjects who meet the initial screening entrance criteria will be scheduled for a baseline assessment to evaluate balance and gait. Subjects will then begin the PoNS Treatment program and re-perform some assessments at 2, 5 and 14 weeks evaluating their functional improvements.