Evaluation of Dysfunction of the Basal Ganglia Before a Parkinsonian Walking in the Elderly: Risk of Falling and Confusional State

Inclusion Criteria: * Age: 75 years, * man or woman, * Diagnostic Criteria for Parkinson walking: at least 3 of the following symptoms: * Loss of swinging arms, * Decrease in stride walking slowly, * feet as glued to the ground, * Trample, * piece U-turn, * kyphotic Attitude, * Tolerance screw physiotherapy screws Exclusion Criteria: * Unrecovered delirium, * Unable to walk for a distance of 6 meters in length without technical assistance, * Traumatic fall phase of rehabilitation, * Acute pathology, * Unstabilized psychiatric pathology, * Symptomatic orthostatic hypotension, * Severe depressive syndrome untreated * Subjects with a sufficient gap to explain the falls: * cerebellar syndrome, * a pyramidal syndrome with sequelae pyramidal deficit and cortical stroke * peripheral pathology, * rheumatic disease, * orthopedic pathology, * Mini Metam State Examination \<18, * Parkinsonism induced by neuroleptics, * Not cured cancer, * Psychotropic drugs (benzodiazepines and antipsychotics) with significant sedative effect inducing excessive daytime sleepiness namely psychotropic half long life, and high dose over 2 psychotropic * Severe heart failure * Severe respiratory failure, * Associated diseases and treatments interfering