128 Chapter 6 Effects of DBS on power spectra Figure 2 shows the power spectra for patients at the three time points and the healthy controls. On average, clear changes in regional alpha and beta power were seen. Figure 2. Power spectra of the patients across three timepoints (T1, T2, T4) and healthy controls (HC; grey). The spectra reveal clear peaks in power in the alpha (8-13 Hz) and beta (14-20 Hz) bands. Figure 3 shows the significance of the within-subject ANOVA on the alpha and beta power values with time (T1, T2, T4) as fixed factor, p-values FDR corrected across the 62 channels. All subjects showed significant change in alpha and beta power over time during DBS treatment for either many channels (patient 1) or nearly all channels (patients 2, 3, 4).
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