Figure 2.

Visualization of overlap between brain‐surface fMRI results and electric potential change in different frequency bands. (A) For three representative subjects: rendering with smoothed fMRI results mapped on the surface (the t‐values for movement versus rest scaled to the maximum, smoothed with a 6 mm cosine kernel for display). Green denotes significant (P < 0.05, Bonferroni corrected) increase in power in HFB, and cyan significant (P < 0.05, Bonferroni corrected) decrease in power in low frequency bands. The panels on the right show the estimated percentage of BOLD signal change per electrode. (B) Group results: for visualization, electrode coordinates were projected to right hemisphere MNI coordinates and displayed on the normalized averaged gray matter across all subjects. Note that power decreases in low frequencies are spatially more distributed than HFB power increases. On the far right the BOLD change for all electrodes is depicted (only for visualization, the estimated percentage of BOLD signal change is normalized with respect to the standard deviation of each subject to eliminate large inter individual differences in the amplitude of the BOLD change and better visualize the overall distribution).