Fig. 1.

Lateral view of all intra-operative recording sites across patients. Each black dot represents the midpoint between the locations of the two lowermost contacts at each recording site as we used a bipolar derivation. The actual volume from which activity was picked up was much larger than a single point in space. The figure contains recordings from both the right and left hemisphere (mirrored in the y-axis). A relatively wide spatial range was sampled including sites inside the STN (shown in green), and sites where it was more likely to pick up activity from the thalamus (blue) or substantia nigra (red). A total of 92 points are depicted (all cases included in the study). The inserted axes indicate 1 cm in each direction. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)