Inclusion Criteria:  diagnosed with PPA by neurologist or speech-language pathologist speech-language deficit arising from PPA native speaker of English Language or equivalent adequate vision (normal or corrected to normal) adequate hearing  Exclusion Criteria:  meeting (Diagnostic and Statistical Manual) DSM-IV criteria for Axis I mood, anxiety, psychotic or substance abuse disorders. highly magnetizable metallic implants, including certain dental work neurological disorders besides the ones of interest for the study (e.g., epilepsy) Multiple Sclerosis Parkinson's Disease contraindications for MRI pacemakers metallic cardiac pumps valves magnetic materials such as surgical clips, implanted electronic perfusion pumps, or any other condition that would preclude proximity to a strong magnetic field. clinically significant claustrophobia severe systemic disease (e.g., renal failure) poor health pregnancy epileptic activity in the past 12 months family history of epilepsy or other seizure disorders brain surgery in the past metallic skull plates or implants skin lesions or skull damage excessive use of alcohol or drugs premorbid psychiatric disease affecting communication severe non-linguistic cognitive disturbances impeding language therapy