Fig. 3.

Sample case 2. In initial recording, some thalamic activity and slight subthalamic nucleus (STN) activity near the target were obtained (left). This trajectory seemed to be too posterior (center top) or too medial (center bottom). In this case, the third ventricle was markedly dilated, and therefore we moved the trajectory 2 mm laterally. Consequently, sufficient STN activity was obtained in the second recording (right).