motion of less than 2.0 mm in any direction and 2.0° of angular motion during the resting state scan. In addition, the volume-level mean framewise displacement (FD) (Van Dijk et al., 2012) was calculated and used as an extra global covariate in the next statistical analysis to exclude confounding effects of head motion. Moreover, an age-appropriate MRI template [i.e., Mayo Clinic Adult Lifespan Template (MCALT)] created recently for the analysis of elderly populations (Christopher et al., 2017) was used to verify the reliability of our results; for this, we performed the prepossessing and space normalization again while matching data with the MCALT.
