Ultrasonic Explorations of Cerebral Tissue Motions - Influence of Aging

Inclusion Criteria: * Patient at least 18 years old * Informed consent form signed * Person affiliated to a medical insurance * Male or female * No smoking the day of the inclusion * Right handed: Edinburgh test ≥0.8 (subjects of phase 2) * MMS score ≥ 27 and 5 words score = 10 (subjects of phase 2) * Socio-educational level greater than or equal to 8 years of school (subjects of phase 2) Exclusion Criteria: * Pregnant women, lactating women or women without reliable contraception * Contraindications to IRM for patients with: ocular metallic foreign object; any electronic medical device implanted by irremovable way (pacemakers, neuro-stimulator, cochlear implants ...); metallic heart valve, old heart valves are specially an absolute contraindication because of risk of dysfunction; vascular clips implanted formerly on brain aneurysm * Acute medico-surgical condition dating from less than 3 months * Neurological and neuro-surgical pathology such as: toxic, infectious or inflammatory encephalopathy, epilepsy, intracranial arteriovenous malformation known, intracranial tumor or hydrocephalus known, operated or no, history of ischemic or hemorrhagic stroke, transient or not * Treatments or pathology that could influence the results of the research: heart failure (dyspnea with stage III or IV NYHA) or non-sinus cardiac rhythm, use of central analgesics or psychotropic drugs * Psychiatrics disorders of axe 1 of DSM IV, based on MINI (subjects of phase 2) * Major subject with a le…