Balance After Traumatic Brain Injury

Inclusion Criteria: Enrollment Criteria for Participant with TBI (TBI+ group) Inclusion criteria * Age 50-75. People of this age normally do not exhibit substantial balance or cognitive impairments, so observing a clear deficit between groups will provide compelling evidence of a TBI-related effect. This "younger old" age group will also help to avoid other comorbid health conditions of older age that would increase variability (uncertainty) in the data set. * Prior history of moderate closed-head TBI at least 10 years prior to study enrollment. Single or multiple TBIs are acceptable. All participants who self-report a prior TBI will complete a standardized interview called the Ohio State University TBI Identification Method (OSU TBI-ID) to characterize and confirm the occurrence of a prior moderate TBI. Moderate TBI will be defined as any of the following: * loss of consciousness from 30 minutes to 24 hours * and/or alteration of consciousness/mental state for greater than 24 hours * and/or post-traumatic amnesia for \>1 to \<7 days * and/or abnormal structural imaging confirmed by medical records * Affirmative response to the question: "At the present time, do you consider yourself to be fully recovered from the TBI?" * Score on the Activities Specific Balance Confidence Scale of 90 or higher (out of 100 possible points), which indicates absence of self-reported balance/mobility deficits. * Score of 19 or higher on the telephone version of the Montreal Cognitive …