Resting oscillations and cross-frequency coupling in the human posteromedial cortex

► Human posteromedial cortex (PMC) is the hub of default mode network. ► PMC displays strong theta band (3-7 Hz) oscillations at rest. ► Phase of PMC resting theta modulates the amplitude of high gamma activity. ► Theta/gamma cross-frequency modulation displays slow fluctuations at ~ 0.1 Hz.