Electrophysiological Evaluation of Voluntary Attention

Inclusion Criteria: Inclusion criteria for patients : * Adults, man or woman, left or right-handed, from 18 years old to 80 years-old ; * Diagnosis : * Locked-in syndrome : \< Brainstem injury, without any evolution for at least 3 week, etiology : vascular, traumatic \< Amyotrophic Lateral Sclerosis \< Following damage to the central or peripheral nervous system * Or Minimal conscious state or Unresponsive Wakefulness Syndrome consecutive to a severe acquired brain injury for at least one month * Or with a severe brain injury, since birth or acquired, for at least one month * Or with Guillain-Barré syndrome * Subjects affiliated to social security; * Signature of consent form by the patient or by a relative (family member or "the trusted person") if obtaining a consent is impossible Inclusion criteria of Healthy subjects * Adults, man or woman, left or right-handed, from 18 years old to 80 years-old ; * Without known auditory impairment * Subjects able to understand the experimental instructions * Subjects affiliated to social security; * Signature of consent form Exclusion criteria of patients and healthy subjects * Medical history : psychiatric disorders (except if due to brain injury), neurologic disorders (except if due to brain injury) * For healthy subjects : history of brain injury * Pregnant women or breastfeeding women * Person under legal protection * Medico-legal conflicts * Absence of consent by the subject or the patient or his/her representant