Figure 7.

Narrow band coherence peaks in the gamma range were not caused by artifacts. Coherence computation was repeated for the data ON drug from the five hemispheres showing clear gamma coherence peaks after excluding trials with artifacts in the window −1 to 1 s relative to the button press in either M1 or STN signal. The criteria for exclusion were the same as for power analysis (see Materials and Methods and Fig. 1). Time–frequency decomposition was the same as for Figures 5 and 6, and the coherence values were averaged between −0.5 and 0.5 s relative to the button press. Raw data for all the trials are shown as well as the coherence spectra. The subject identification numbers and the trial numbers are detailed on the right.