Fig. 6

Correlations in the core memory network. a Power-synchrony correlations in the core memory network: the 37 ROIs with significant HG power subsequent memory effect (SME). b Power-synchrony correlations across the 37 ROIs with the no significant HG power effects. Among the core memory network—consisting mostly of left frontal, temporal, and MTL cortex—z-scored gamma power and z-scored synchrony were significantly anticorrelated, while theta synchrony and gamma power were significantly positively correlated (top row; P < 0.001 and P < 0.01 via permutation test, respectively). Among regions that did not exhibit strongly modulated HG activity in successful memory encoding, HG power and synchrony were still inversely correlated (Pearson correlation, r = −0.158, P < 0.05), but theta synchrony was not significantly predictive of HG power (r = 0.131, P = 0.12)