Patients with Parkinson's disease (PD) will perform computer tasks involving reaching and tapping movements during video recording of movements and electrophysiological recording of brain signals during deep brain stimulation surgery. Experimental manipulations involve different computer stimuli that manipulate the presence or absence of sensory and motivational movement cues. The same experimental manipulations are delivered to all individual subjects. 40 PD patients who are undergoing deep brain stimulation (DBS) surgery for treatment of Parkinson's disease, will perform the tasks during awake surgery and recordings will be obtained from 2 implanted DBS electrodes as well as 2 temporary electrode strips placed on the surface of the brain for research purposes. Study procedures are limited to the intraoperative environment with no additional study visits. All patients will also be asked to perform clinical rating scales and questionnaires and undergo a movement disorders neurological exam.
Several strategies or contexts help patients with Parkinson's disease to move more quickly or normally, however the brain mechanisms underlying these phenomena are poorly understood. The proposed studies use intraoperative recordings during DBS surgery for Parkinson's disease to understand the brain mechanisms supporting improved movements elicited by external cues. The central hypothesis is that distinct networks are involved in movement improvement depending on characteristics of the facilitating stimulus. Participants will perform movement tasks during awake surgery performed exclusively for clinical indications. The identified biomarkers may provide targets for future neuromodulation therapies to improve symptoms that are refractory to current treatments, such as freezing of gait.