FIGURE 4.

LFP patterns of selected and non-selected (other) tracks. (A) DFM averages of LFPs recorded from selected and other tracks 5 mm above and below the dorsal border of 19 STNs. One hemisphere which was repositioned due to side effects without recordings was excluded from the electrophysiological averages. The white dashed lines represent the dorsal border and, the dorsal and ventral regions of STN. Upon entry to the STN, there was a marked increase in the beta and HFO activity. The dorsal half was dominated with slow HFOs (200–280 Hz) whereas the ventral half had HFOs in the 280–400 Hz range. (B) The beta and HFO bandpowers are contrasted between selected and other tracks in three spatial regions: above (5–0 mm), dorsal (0 to -2 mm) and ventral (-2 to -5 mm) STN. There was significant difference in both beta and HFO bandpower in dorsal and ventral regions (p < 0.01, n = 19). (C) The CFC patterns contrasted from the same depth regions revealed beta-slow HFO coupling in the dorsal territory, whereas there was beta-fast HFO coupling in the ventral territory of the selected track. (D) The mean beta-HFO coupling strength was significantly higher in both dorsal and ventral territories (p < 0.05, n = 19).