Figure 2. Comparison of weighted global (E_glob) and local (E_loc) efficiency in brain networks.

Average network properties are shown for both age groups and listening conditions across the range of network costs (0.1–0.4). To control for individual differences in network connection strengths, normalized global and local efficiency were obtained by comparing network measures to values from randomized surrogate networks (bottom panels). Error bars indicate the standard error of the mean. (O, older adults; Y, younger adults; Q, quiet listening condition; N, noisy listening condition).