FIGURE 4.

Schematic representation of quantitative measures used. a, trajectory accuracy: lateral shift between planned and executed trajectories, in plane perpendicular to executed trajectory that passes through target point. b, electrode deviation: lateral shift between electrode contact and executed trajectory, in plane perpendicular to executed trajectory that passes through target point. c, electrode accuracy: lateral shift between electrode contact and planned trajectory, in plane perpendicular to planned trajectory at target point. d, deviation of electrode length from planned trajectory, as seen in trajectory view on S7 StealthStation.