Transcranial Alternating Current Stimulation in Post Stroke Aphasia Therapy

Inclusion Criteria: * presence of aphasia (Broca's or mixed) * first ever stroke with one major lesion in left hemisphere * chronic stage (at least 6 months since onset) * right handedness * capability to give an informed consent * Native Polish speaker * 5-80% correct responses in the first naming task Exclusion Criteria: * history of neurosurgical interventions * history of other neurological or psychiatric conditions (including dementia, head trauma, alcohol abuse etc.) * reports of seizures during last 36 months * serious vision disorders * medications increasing risk of seizures or influencing neuroplasticity * electrically, magnetically or mechanically activated implants or other systems sensitive to electricity in the body * history of language and/or speech disorders or intellectual disability in childhood * bilingualism * pregnancy * claustrophobia