Study of the Effect of a Cognitive Task on Static Balance in Depressive Elderly Subjects According to the Double Task Principle

Inclusion Criteria: In the 2 groups: * General and cognitive status allowing the patient, according to the evaluation of the investigators, to take part in the study. * Patients who provide written informed consent * Patients covered by the national health insurance agency In the "depression " group: * Age ≥ 75 years, * Subjects with a depressive syndrome, according to Geriatric Depression Scale criteria. * Patients without treatment with antidepressants In the "control" group: * Age ≥ 75 years, * Absence of a depressive syndrome Exclusion Criteria: In the 2 groups: * Presence of a disabling orthopedic disease, * Presence of any chronic neurological disease (cerebrovascular accident, Parkinson's syndrome …), * Presence of a psychiatric disease apart from depression in the " depression " group * Presence of a vestibular disease with clinical manifestations, * Presence of a non-corrected visual disorder, * Existence of a progressive organ disease, * Psychotropic treatment able to impair vigilance and posture, * Notion of one or several falls in the preceding 6 months, * Oppositional personality or low motivation, * Emotional or intellectual disorder. * Patients under guardianship * Patients who have taken part in a therapeutic trial in the previous 30 days