Acceptance and Commitment Therapy Integrated Vestibular Rehabilitation (ACTIVE) RCT

Inclusion Criteria: * 18-49 years of age * Normal/corrected vision * Diagnosed with mTBI per military clinical practice guidelines (CPGs) that occurred over 8 days prior to consent as determined by a multi-domain assessment performed by a licensed healthcare professional. * Reported or observed signs of mTBI including loss of consciousness, amnesia, disorientation/confusion, dizziness, imbalance, memory problems, vomiting at the time of injury as determined by self-report. * Positive for mTBI-related vestibular symptoms and/or impairments per a concussion common data elements (CDE) assessment. Participants must demonstrate a positive finding in at least one of the following tests: DVAT (\>2 lines lost), DNRS (\>2/10 score), VVAS (\>0 on 2 or more items), VOMS (\>2 score on VOR or VMS), mBESS (\> 9 total errors), and CP-Screen (avg vestibular factor score \>/= 2 or single item = 3 severity) Exclusion Criteria: * History of vestibular disorder (e.g., benign paroxysmal positional vertigo, unilateral or bilateral vestibular hypofunction) as determined by patient self-report and/or by Physical Therapist exam. * Exercise-induced dizziness as determined by the Physical Therapist exam. * History of neurological disorder (e.g., epilepsy, multiple sclerosis) as determined by self-report. * Cervical spine injury or dysfunction (i.e., limited range of motion; ROM) as determined by self-report. * Previous moderate to severe TBI as determined by self-report. * \< 8 days following curren…