In a different study, Gao et al. (Gao et al., 2009) used a similar strategy to identify hubs in default-like components in young children, and calculated betweenness centrality on networks of 6, 13, 19, and 7 nodes in cohorts of neonates, 1 year olds, 2 year olds, and adults, respectively. Each cohort returned the highest betweenness centrality in the PCC, but it is questionable whether such techniques are truly meaningful in networks of only 6 or 7 nodes, since the addition or deletion of a single edge could substantially alter many shortest path lengths.
