Inclusion Criteria:  First stroke affecting the right-hemisphere Presence of USN, as assessed by a standard neuropsychological evaluation Structural images of the brain lesion available (magnetic resonance or tomographic scans) Criteria for electrical brain stimulation Good (or corrected) visual acuity High proficiency in French Right-handed  Exclusion Criteria:  Presence of general cognitive deficits and/or suspicious of possible cognitive deficits Presence of difficulty in task's comprehension Impossibility to sustain a research session of at least 45minutes (e.g., attentional lability) Precedent additional neurological disorder and/or current or precedent psychiatric disease Presence of one or more exclusion criteria for the electrical brain stimulation 18, as following:  Presence (or suspected presence) of metal in the brain or skull or body (except titanium) (e.g. splinters, fragments, clips, etc.) Presence of cochlear implants, implanted neuro-stimulator (e.g., DBS, epidural/subdural, VNS), cardiac pacemaker, medication infusion device, spinal or ventricular derivations Presence of epilepsy (participant and/or the close family) and/or precedent epileptic seizures (participant) Presence of a fainting spell or syncope, due to neurological diseases (not consider syncope during blood sampling or after being in a warm environment or after emotionally stressful events) Presence of a severe (i.e., followed by loss of consciousness) head trauma Presence of hearing problems or ringing in your ears (e.g. tinnitus) Current treatment under psychoactive (e.g. antidepressants, tranquilizers) or antiepileptic medications Chronic headache For women: you are pregnant or there is any chance that you might be.