The goal of this study was to investigate the nature of spontaneous BOLD fluctuations in white-matter (WM) of spinal-cord and to use these to identify the intrinsic functional architecture of WM tracts and their correlations with the gray-matter (GM) hubs. Connectivity measures were obtained using resting state BOLD signals between WM-WM and WM-GM regions, followed by network analysis using graph-theory. We found WM and GM hubs on the dorsal side exhibit greater temporal correlation as exhibited by their stronger node strength in resting state. Also, within segment WM-WM and WM-GM correlations were found to be stronger than those between segments.
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