Quantification of Beta Activity in Routine EEG Recordings in Parkinson's Disease Patients

The investigators are studying the relationship between a certain oscillatory brain rhythm (13-30 cycles/sec) that emerges prominently in patients with Parkinson's disease and symptoms of slowness of movement. The investigators are recruiting patients with a range of severity of Parkinson's disease symptoms to perform electroencephalography (EEG), in which the study team records brain waves using electrodes placed on the scalp, while patients sit at rest or perform certain hand tasks. The investigators will analyze the recorded brain waves to extract the brain rhythm of interest and relate it to motor symptom severity as well as study its behavior during rest and hand movement.