Individualized Brain Stimulation to Improve Mobility in Alzheimer's Disease

Inclusion Criteria: * Men and women aged 65 and older living within supportive housing facilities * Mild Alzheimer's disease (AD) defined by the combination of 1) at least mild cognitive impairment defined as a modified TICS score of ≤ 34, 2) informant-report of Instrumental Activities of Daily Living impairment as defined as a score of ≥ 6 on the NACC Functional Activities Questionnaire, and 3) a Clinical Dementia Rating score of 1. Exclusion Criteria: * Inability to secure informant participation * Unwillingness to cooperate or participate in the study protocol * An inability to ambulate without the assistance of another person (canes or walkers allowed) * A clinical history of stroke, Parkinson's disease or parkinsonian symptoms, multiple sclerosis, normal pressure hydrocephalus, or other neurological conditions outside of mild AD. * Any report of severe lower-extremity arthritis or physician-diagnosis of peripheral neuropathy * Use of antipsychotics, anti-seizure, benzodiazepines, or other neuroactive medications * Severe depression defined by a Center for Epidemiologic Studies Depression scale score greater than 16 * Any report of physician-diagnosis of schizophrenia, bipolar disorder, or other psychiatric illness * Contraindications to MRI or tDCS, including reported seizure within the past two years, use of neuropsychological-active drugs, the risk of metal objects anywhere in the body, self-reported presence of specific implanted medical devices (e.g., deep brain s…