NEURO - Prognostication Using Late Somatosensory Evoked - Potentials

Inclusion Criteria: * Patients must be aged 18 years or over; * Patients must be admitted to the intensive care unit with a cerebrovascular pathology; * Patients must be in a comatose state with a Glasgow score strictly less than 8, 24 hours after stopping sedation. * Representative of the patient informed of the research and not objecting to it, information and collection of the participant's non-objection if recovery of the ability to understand the content of the information note, * The patient is a recipient of or affiliated with a social security scheme. Exclusion Criteria: * Bilateral lesions of the motor cortex or cortico-spinal fasciculus, * Cutaneous infection of the scalp or any other lesion making surface electroencephalography impossible, * Patient whose short-term survival (48 - 72 hours) seems compromised, * Severe peripheral neuromyopathy, * Severe Acute Respiratory Distress Syndrome at the time of screening, * Hearing-impaired patients with hearing aids, * Pregnant or breastfeeding woman, * Patient under legal protection (persons deprived of their liberty or under guardianship).