Diagram depicting the capsule implantation site in relation to the striatum, the substantia nigra, and the medial forebrain bundle. A, Sagittal view; B, horizontal view. The implanted capsule is represented by thehatched area. CPu, Caudate putamen;GP, globus pallidus; EP, enteropeduncular nucleus; MFB, medial forebrain bundle;SNc, substantia nigra pars compacta; SNr, substantia nigra pars reticulata; STN, subthalamic nucleus [adapted from Paxinos and Watson (1986)].