larger for the HCP data set (see Figure 4), and most likely caused by their discrepancy in T2-weighted MRI acquisition. Critically, the cross-sectional results reported herein were verified with respect to the young adults on the original MRIs provided by HCP (i.e., 0.7mm isotropic resolution; see Appendix A.1), thereby ensuring that the identified difference to the younger adolescents were beyond the effect of partial voluming.