The current research protocol aims at studying preparatory inhibition in two populations of patients suffering from movement disorders. First, in PART 1, we will work with Parkinson's disease (PD) patients to investigate the contribution of the basal ganglia in preparatory inhibition (Project 1 \[P1\] and Project 2 \[P2\]). Then, in PART 2, we will consider patients with focal hand dystonia (FHD), to test the hypothesis that altered muscle selectivity in this pathological condition is, at least in part, due to a lack of preparatory inhibition.
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TMS measures of preparatory Inhibition
Timeframe: Every participant comes to the laboratory on two consecutive days. All data is acquired on those two days and there are no follow-up measurements. Data acquisition is expected to take up to 6 months per arm.
Reaction times and movement times during the task
Timeframe: Every participant comes to the laboratory on two consecutive days. All data is acquired on those two days and there are no follow-up measurements. Data acquisition is expected to take up to 6 months per arm.