tDCS in Post-COVID Syndrome: Comparison of Two Targets

Inclusion Criteria: * Confirmed diagnosis of COVID-19 at least 6 months before the participation in the study. * Diagnosis of post-COVID condition according to WHO criteria. * Age 18-65 years. * Spanish as native language. * Sign of written informed consent. Exclusion Criteria: * History of stroke * History of traumatic brain injury or central nervous system infection * Diagnosis of other neurological or medical disorder that could impact on fatigue. * Diagnosis of active psychiatric disorder potentially impacting on fatigue or cognitive function. * Chemotherapy or radiotherapy for cancer. * Severe sensory deficits (e.g. visual loss) that could limit assessments included int the study protocol. * Taking drugs or uncontrolled medical disorder potentially causing or worsening fatigue. Specifically, uncontrolled adrenal insufficiency, miastenic syndromes, thyroid disorders, cardiac failure, chronic kidney disorders and neurodegenerative disorders are excluded. * History of abuse of alcohol or other toxics. * Any contraindication for transcranial electric stimulation: epilepsy, pregnancy, metallic implants, brain devices, pacemakers, head injuries).