Can Magnetic Brain Stimulation Improve Language Function in Primary Progressive Aphasia

Inclusion Criteria: * Diagnosis of PPA-L (confirmed by a neurologist or neuropsychiatrist who has observed the patient for at least one year); * Mild to moderate language impairment as assessed by the Druks and Masterson Naming Task; * Native English speaker. Exclusion Criteria: * Cerebrovascular disorders, hydrocephalus or intra-cranial mass, documented by MRI; * History of traumatic brain injury, seizures, or another neurological disease; * Significant medical problems (e.g. poorly controlled diabetes or hypertension or cancer within the past 5 years); * Major depressive disorder, bipolar disorder, schizophrenia, substance use disorder or mental retardation according to the criteria of the DSM-IV; * Any contraindication for rTMS (e.g., implanted metal devices; cardiac pacemaker or pacemaker wires; neurostimulators; implanted pumps, metal in the body \[rods, plates, screws, shrapnel, dentures, IUD\] or metallic particles in the body, surgical clips in the head, previous neurosurgery, cochlear implants, prosthetic heart valves); * Currently pregnant or breastfeeding.