Figure 2.

Blood oxygen level-dependent signal analysis. (A) BOLD fluctuations for each community (1: black; 2: red) and for the difference (blue). (B) Correlation between the synchronization level of the two communities versus the noise level: simulations (points) and non-linear least-squared fitting (curve). Note the stochastic resonance effect: there is an optimal noise level for which both communities are maximally anticorrelated. Figure adapted from Deco et al. (2009).