Fig. 1: Power and Connectivity for a sample subject in slow gamma band across left and right seed electrode groups
(a) Average scalp map of absolute slow gamma band power (in log10 (µV2) units) during stimulus duration [0.25 0.75] s across 64 electrodes, for a representative subject. (b) Similar to (a) for change in slow gamma power computed relative to the baseline power, corresponding to the interval [-0.5 0] s, in decibels (dB). Note that the predominant power is in occipital electrodes in (a) and (b) scalp maps. (c) Change in power spectral density (PSD) across the left and right seed electrode groups. These electrode groups are shown in black circles in b. Dashed lines indicate the slow gamma range. (d) The scalp map of average FC measured using PPC between all the electrodes within each of the seed electrodes in the left (electrodes P3, P1, and PO3; top plot) and right (P2, P4, and PO4; bottom plot) groups. (e) Functional connectivity as a function of inter-electrode distance from the seed electrodes plotted for each of the three electrodes in the group with the other remaining electrodes. Schematic on top right shows the four electrode clusters (frontal, central, occipital, and temporal) defined over both the hemispheres, denoted by the four colours, cyan, red, yellow, and green respectively, with the hemisphere side denoted by filled circle for left and open triangle for right.