Fig. 3

Main effects of the seven factors on SSI-induced distortions in interregional phase coherence measured by PLV difference between original and interpolated data (dPLV). As shown in the bar graphs, SSI with a larger number of electrodes had larger dPLV than those with a smaller number of electrodes, but dPLV was not different between low (alpha) and high (gamma) frequencies in general. All of the three SSI parameters had a strong effect in dPLV, where SSIs with m = 4, smaller n, and larger λ resulting in larger dPLVs than those with the other parameter values. Near pair-electrodes had larger dPLV than distant pair-electrodes. SSI-induced dPLV also significantly varied across the locations of the interpolated electrodes