Superiority Trial of Aphasia-focused Rehabilitation With tDCS Stimulation

The purpose of this study is to help us understand if adding transcranial Direct Current Stimulation (tDCS), a non-invasive brain stimulation technique, to Speech Therapy improves language recovery in people with Broca's aphasia and is more effective than Speech Therapy alone.

Inclusion Criteria: * Be willing and able to give informed consent. * Be willing and able to comply with study requirements. * Be between 25 and 80 years of age. * Have used English as the primary language for \> 15 years. * Have the diagnosis of aphasia due to a left hemisphere stroke, confirmed by study physician based on past clinical MRI scan or research scan. * Be greater than 6 months post-stroke. * Have Broca's aphasia diagnosed by the WAB-R (fluency score ≤ 5, auditory verbal comprehension score 4-10, repetition score 0-7.9, naming and word finding score \< 9). * Correctly name 140 or fewer items on the PNT. Exclusion Criteria: * History of brain surgery except for during the treatment of the acute stroke. * Seizures during the previous 12-months. * Compromised skin at or near electrode sites (e.g., rash, eczema, wounds, infection). * Correctly name more than 140 out of 175 items during the pre-treatment picture naming test (Philadelphia Naming Test). * Western Aphasia Battery-Revised Aphasia Quotient (WAB-R AQ) score of 25 or below. * Participants with open skull defects (e.g., greater than 1 cm) in the area underneath the anode electrode positioning or participants with metal implants or electrical stimulators. * Participants with continuous oxygen therapy which cannot be discontinued for more than 1 hour. * Any condition or situation that the PI determines would significantly interfere with the participant's ability to complete the study.