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. 2021 Jul 14;15:690633. doi: 10.3389/fnins.2021.690633

FIGURE 3.

FIGURE 3

The computation of the adjacent matrices from the PDC/DTF in the different frequency bands. The matrices of PDC or DTF we calculated were 3D [πij (f) and vij (f) were the elements of the 3D PDC and the DTF matrix, respectively]. The two Ds of PDC or DTF matrix were channels [i and j: FP1 (Ch1), FP2 (Ch2), F7 (Ch3), F8 (Ch4), F3 (Ch5), F4 (Ch6), O1 (Ch7), and O2 (Ch8)], and the third D was f: frequency (0–64 Hz). We divided the third D into the following ranges: Delta (δ): 0.5–4.0 Hz, Theta (θ): 4.0–8.0 Hz, Alpha (α): 8.0–14 Hz, Beta (β): 15.0–30.0 Hz, Low gamma (γ): 30.5–50 Hz, All: 0–50 Hz, and then computed the mean value of functional connectivity in different ranges. Hence, the six matrices of different frequency ranges were computed and plotted in the right of the figure. Due to the different values between the two channels, eight channels were represented twice, as row and column headings.