A: The voxel-wise ICC values of RSFC with respect to a PCC seed under different SNR levels (SNR is defined as the ratio of the amplitude of fluctuations < 0.2 Hz to > 0.2 Hz, averaged across voxels in the slice, each column) and session numbers (by partitioning each subject’s scan to multiple windows, each row). B: ICC values (a), between-subject (b) and inter-subject (c) variability averaged within all voxels of the displayed slice in A (‘All’, numbers in the parenthesis are the window number), and voxels significantly correlated with the PCC seed at the group level (‘Active’, evaluated across 10 subjects using the entire scan dataset filtered < 0.2 Hz, p < 0.05, uncorrected)