Test-retest assessment of independent component analysis-derived resting-state functional connectivity based on functional near-infrared spectroscopy

►FNIRS-based, ICA-derived RSFC is reliable at the map- and cluster-level. ►ICA is suitable for resting-state fNIRS study as a reliable RSFC-detection tool. ►Cluster-wise analysis is suggested for future resting-state fNIRS study. ►Channel-wise RSFC should be carefully interpreted because of low reliability. ►Group-level RSFC is more reliable than individual-level RSFC.