Depicted is a reconstruction of bihemispheric DBS electrodes that have been surgically placed into the most common target structure for treatment of Parkinson's Disease, the subthalamic nucleus (orange). Other subcortical structures include the red nucleus (green), the substantia nigra (yellow), the internal (cyan) and external (blue) pallidum and the striatum (red). A stimulation volume is modeled by applying 2V (at 1000Ω impedance) to the second-uppermost contact of the left electrode. Structural fibertracts traversing through this volume are visualized and cortical regions that they connect with the stimulation volume are selected from an automatic anatomical labeling atlas and visualized. Picture created using LEAD DBS software (www.lead-dbs.org)