Testing Personalized High-Definition Transcranial Direct Current Stimulation (HD-tDCS) as a Treatment of Posterior Cortical Atrophy

Inclusion Criteria: * Diagnosis or symptoms consistent with PCA * Fluent in English * HD-tDCS compatible * Stable on relevant medications for at least approximately 4 weeks prior to study enrollment * If completing any additional, optional, long-term study visits in a remote location (i.e., not our office), a study partner is required in order to administer HD-tDCS. Those choosing to return to our office may have, but are not required to have, a study partner. Exclusion Criteria: * Other relevant neurological disease (e.g., epilepsy) or injuries (e.g., large vessel stroke, moderate-severe traumatic brain injury) viewed as primary to deficits since these could interfere with etiologic considerations and confound study results * Active, relevant psychiatric conditions (e.g., bipolar disorder, schizophrenia) since the symptoms of these conditions may confound study participation. * A recent (e.g., within the past 2 years) significant history of, or current, alcohol or drug abuse/dependence. Remote history of abuse/dependence is not exclusionary as long as it is not considered to be the primary etiology for visuospatial deficits. * Women that are lactating/breastfeeding, pregnant, or may potentially be pregnant will be excluded from the study.