Cerebellar Transcranial Direct Current Stimulation and Aphasia Treatment

Inclusion Criteria: * Participants must have sustained a left hemisphere stroke. * Participants must be fluent speakers of English by self-report. * Participants must be capable of giving informed consent or indicating another to provide informed consent. * Participants must be age 18 or older. * Participants must be premorbidly right handed. * Participants must be at least 6 months post stroke. * Participants must have an aphasia diagnosis as confirmed by the Boston Diagnostic Aphasia Examination (BDAE) Short Form. * Participants must achieve at least 65% accuracy on screening task (comparable to treatment task) on 1 of 3 attempts Exclusion Criteria: * Participants with lesion involving the right cerebellum * Previous neurological or psychiatric disease. * Seizures during the previous 12 months. * Uncorrected visual loss or hearing loss by self-report. * Use of medications that lower the seizure threshold (e.g., methylphenidate, amphetamine salts). * Use of N-methyl-D-aspartate receptor (NMDA) antagonists (e.g., memantine). * \> 80% (140 out of 175) correct responses on the Philadelphia Naming Test at baseline. * History of brain surgery or any metal in the head. * Scalp sensitivity (per participant report).