Figure 6.

Peak extraction (CAR). Peaks were not present away from the GPi (e.g. location 8, 1^st row). At locations 9 and 10 (not illustrated) there was not usually a peak, but if present it was either weak (< 1 dB) or a result of re-referencing using the common average reference and bipolar configurations. At target (location 16) in the rest condition peaks were present for all 7 subjects (2^nd row). During movement the peak heights were increased by ~0.7 dB (Figure 7 B) for all subjects (3^rd row). In different configurations (MON, BIP) not all subjects showed an increase (Figure 7 A, C).