Pilot study: * Longitudinal follow up of the PRODY-GI cohort for parkinson's disease (PD) * Observational study of upper and lower axial symptoms' occurence in 30 PD patients in on and off drug conditions, 30 aged matched control subjects and 10 control subjects with supra nuclear palsy * Multi modal approach: functional MRI, clinical , ENT assessment, respiratory assessment, neuropsychological and gait evaluations
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Change in the neural network between patients in OFF levodopa conditions and control subjects
Timeframe: Between two evaluation visits, on average at 3 months (baseline- 3 months)