Numbers represents the relative percentages of diffusion fibers generated between each seed structure and all other target structures. Each number was generated from the averages of left seed structure to left target structure and right seed structure to right target structure. The numbers were then divided by total fibers generated from a seed structure and other target structures, then represented in percentages. Both target and seed structures are GPe, globus pallidus external; GPi, globus pallidus internal; STN, subthalamic nucleus; SNr, substantia nigra reticular; SNc, substantia nigra compact; CP, caudoputamen.