DetectFoG : Detection of Gait Freezing Episodes in Parkinsonian Patients Using Inertial Measurement Units

"Each patient will have 2 visits :~* First visit in the ON state phase, i.e. when their oral treatment allows the maximum improvement of dopamine-responsive parkinsonian symptoms.~* A second visit will be scheduled 15 +/- 7 days from the first. Patients will then be assessed in the OFF phase after having stopped taking their antiparkinsonian medications for at least 12 hours before the start of the visit, in order to promote episodes of FOG~For each visit, the patient will be asked to walk at a comfortable speed under the following 3 conditions:~* Normal condition without addition of additional physical and verbal tasks~* Condition with added physical tasks: The physical task of holding a ball in the center of a tray~* Condition with added verbal tasks: The verbal task of saying as many words as possible starting with a specific letter.~Conditions of passage are randomized per patient. Each subject will complete the course a maximum of 18 times in blocks of 3 conditions."