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

Inclusion 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) aboutaverage stride time larger and equal to 0.025 during straight-line walking atpreferred speed.

Exclusion Criteria:

• 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 otherneurological 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 requireshospitalization or active treatment within the past 3 months.

• Current treatment for congestive heart failure, angina, uncontrolled arrythmia, deepvein thrombosis, or other uncontrolled cardiovascular events.

• Myocardial infarction, coronary artery bypass grafting, angioplasty, or othercardiac 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, contactlenses, medicine, or surgery.

• Those without WiFi access

• Those who do not plan to live in their current homes for the duration of the study