In this project,it is planned to to conduct two studies involving each several studies. The goal of the first study is twofold: first better understand the motor adaptation deficits specific to different stages of PD disease, and then investigate the influence of the dopaminergic medication on the latter. In this purpose, the behavioral performance and the electrophysiological (EEG) activity in PD patients will be examined during the early and more advanced stages of the pathology, on medication or not (ON or OFF L-Dopa). The specific interest of this study in the relationship between the beta-band activity and, on one side, potential deficits in the explicit cognitive strategies recruited in the initial phase of adaptation and, on the other side, anomalies in reinforcement learning mechanisms implicated in motor adaptation. A secondary goal will be to interpret the observations in light of neuroimaging data. The aim of the second study will be to explore oscillatory and synchronized activities in the BG-cortex loops during motor adaptation to visual or mechanical perturbations. The recording of NST LFP and EEG will implicated the participation of implanted PD patients.