HDtDCS in Logopenic Variant PPA: Effects on Language and Neural Mechanisms

Inclusion Criteria: * Diagnosed with language variant Primary Progressive Aphasia (lvPPA) subtype, defined as either clinical lvPPA or imaging-supported lvPPA in accordance with the most recent diagnostic criteria (Mesulam., 2001; Gorno-Tempini et al., 2011). * Fluent in English. * 45 years of age or older. * Structural brain MRI performed within 3 years prior to enrollment. Exclusion Criteria: * Severe cognitive, auditory or visual impairments that would preclude cognitive testing. * Presence of major untreated or unstable psychiatric disease. * A chronic medical condition that is not treated or is unstable. * The presence of cardiac stimulators or pacemakers. * Any metal implants in the skull * Contraindications to MRI * History of seizures * History of dyslexia or other developmental learning disabilities.