Gait and Alzheimer Interaction Tracking (GAIT) Study

Inclusion Criteria: * Age ≥ 60 years * Able to walk without walking aid on 15 metres * Score of Mini-Mental Examination (MMSE) \> 10 * Written informed consent to participate in the study (or trustworthy person) * Being affiliated to a social security regime * Near visual acuity ≥ 2/10 * Absence of severe depression (score in the 15-item Geriatric Depression Scale ≤ 10) Exclusion Criteria: * Score of Mini-Mental Examination (MMSE) ≤ 10 * Subject suffering from pre-existing impellent disturbances * History of cerebrovascular accident or other cerebro-spinal pathology * Poor workmanship of the written or oral French language * Refusal of subject to be informed on possible hanging bare anomaly during study * Use of walking aid * Acute medical or surgical disease in the past 3 months * Refusal to participate (or trustworthy person) * Contra-indication to the achievement of a Magnetic Resonance Imaging * Near visual acuity \< 2/10 * Presence of severe depression (score in the 15-item Geriatric Depression Scale \> 10)