Non-invasive Brain Stimulation to Improve Unsteady Gait in Older Adults (StimGait)

Eligibility Criteria

• * Aged 65 and above.
• * Ability to speak and read English.
• * Ability to walk independently and continuously for at least 1 minute.
• * Elevated gait variability as defined by a coefficient of variation (CoV) about average stride time larger and equal to 0.025 during straight-line walking at preferred speed.
• * More than mild cognitive impairment defined by a Montreal Cognitive Assessment (MoCA) score less than 18.
• * Parkinson's disease, multiple sclerosis, stroke, active brain tumor, or other neurological disorders.
• * Self-reported pain or lower extremity deformity that significantly disrupts walking.
• * Contraindications to MRI or tDCS.
• * An episode of acute illness or exacerbation of a diagnosis that requires hospitalization or active treatment within the past 3 months.
• * Current treatment for congestive heart failure, angina, uncontrolled arrythmia, deep vein thrombosis, or other uncontrolled cardiovascular events.
• * Myocardial infarction, coronary artery bypass grafting, angioplasty, or other cardiac conditions within the past 3 months,
• * Active cancer for which chemo/radiation therapy is being received.
• * Psychiatric co-morbidity including major depressive disorder, schizophrenia, psychosis, or other psychiatric illness.
• * Recent use of any sedating medications (sedatives, anti-psychotics, hypnotics, anti-depressants) or change in medication within the previous month.
• * Chronic vertigo or other diagnosed vestibular disorders.
• * Legal blindness, visual impairments that cannot be corrected with glasses, contact lenses, medicine, or surgery.
• * Those without WiFi access
• * Those who do not plan to live in their current homes for the duration of the study