Following Zang et al. (2004), a within-subject analysis was first performed using the ReHo approach. The ReHo value in the brain was measured using Kendall’s coefficient of concordance (KCC) (Kendall and Gibbons, 1990) between the time series of a given voxel and its nearest 26 neighbors. Specifically, we first calculated the KCC for each voxel across the whole brain to derive the ReHo map for each subject. In order to reduce the effect of individual variability, each ReHo map was then divided by the mean ReHo value of the whole brain.
