The aim of the present project is to document the relationship between the behavioral deficits and the electrophysiological anomalies observed in PD patients in tasks involving motor adaptation to visual or mechanical perturbations. Recent electrophysiological studies have revealed anomalies in the oscillatory activity in the BG-cortex loop in PD; namely the activity in the beta band (~20Hz) presents an excessive synchronization that might contribute to some behavioral symptoms. Interestingly, recent work has demonstrated that the synchronization in the BG and their cortical projections is 1) diminished by treatments such as dopaminergic medication (L-Dopa) or deep brain stimulation of the subthalamic nucleus (NST), and 2) modulated in relation to movement-error processes.