Vestibular Therapy in Alzheimer's Disease

Who May Qualify: - Diagnosis of AD based on the National Institute on Aging-Alzheimer Association 2011 criteria that is mild-moderate (CDR=0.5-2). - Age ≥ 60 years. - Vestibular loss defined as bilaterally impaired vestibular responses (semicircular canal or otolith responses). - Able to participate in study procedures including vestibular physiologic testing, balance and gait assessment, neurocognitive testing, and VT or active control. - Able to give willing to sign a consent form, as further detailed in the Human Subjects section. The investigators anticipate that individuals who are too impaired to provide willing to sign a consent form would also not be able to effectively participate in VT or active control. - Presence of a caregiver, defined as an individual who spends at least 10 hours per week with the patient. The caregiver must be able to participate in study procedures, specifically the text-messaging system. Both the VT and active control involve 8 weeks of once weekly visits and daily home exercises, and the investigators believe a caregiver would increase the likelihood of successful completion of either therapy. Who Should NOT Join This Trial: - Diagnosis of severe AD (CDR≥3). - Diagnosis of mild cognitive impairment or diagnosis of non-AD dementia, for example Parkinson's disease dementia, Dementia with Lewy Bodies, vascular dementia, fronto-temporal dementia, and primary progressive aphasia. - Deemed unable to participate in study procedures and VT or active control, (e.g. patients with significant medical comorbidities, excessive agitation, or use of mobility aids such as a cane or walker.) - Use of daily vestibular suppressant medications, specifically anti-histamines and benzodiazepines, as this can alter the response to VT. - Lack of availability to participate in 8 weeks of VT or active control. Always talk to your doctor about whether this trial is right for you.