Fig. 7.

LFP-EEG coherence at FTG frequencies. A.-E. EEG channel with greatest coherence is shown for all FTG subjects. For during blocks analysis, time series were concatenated within subjects. For after block analysis, signals in a 5-s time window following cessation of DBS were concatenated within subjects. In patient 4 and 5 short and long DBS blocks were concatenated together. If not 130 Hz, DBS frequencies are shown on top of the plots. EEG channels are colour coded. Black horizontal line denotes the significance level (see Methods). Black arrowheads indicate the corresponding frequency of the FTG peak in the STN-LFP power spectrum. Coherence at FTG frequency was significant in all subjects shown. Note that artefactual coherence is variously seen at 50 Hz (line noise), 65 Hz (subharmonic of 130 Hz DBS) and 90 Hz (subharmonic of 180 Hz DBS).