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. 2008 Jan 24;30(2):638–649. doi: 10.1002/hbm.20530

Figure 2.

Figure 2

Economical properties of brain functional networks. The global (i.e., E glob) and local efficiency (i.e., E loc) of brain networks in both controls and ADHD groups increase monotonically with the cost. The cost efficiency (the difference between the global efficiency and cost, i.e., E glob − C G) has a maximum value at the cost of 0.2 (the black arrows). The broken lines denote plus andminus one standard error of the mean corresponding to network parameters. The vertical lines denote the cost of 0.15, associated with the sparse networks used in Fig. 3 through Fig. 6.