Human brain mapping, Vol. 30, No. 2. (24 February 2009), pp. 625-637. The default mode network (DMN), based in ventromedial prefrontal cortex (vmPFC) and posterior cingulate cortex (PCC), exhibits higher metabolic activity at rest than during performance of externally oriented cognitive tasks. Recent studies have suggested that competitive relationships between the DMN and various task-positive networks involved in task performance are intrinsically represented in the brain in the form of strong negative correlations (anticorrelations) between spontaneous fluctuations in these networks. Most neuroimaging studies characterize the DMN as a homogenous network, thus few have examined the differential contributions of DMN components to such competitive relationships. Here, we examined functional differentiation within the DMN, with an emphasis on understanding competitive relationships between this and other networks. We used a seed correlation approach on resting-state data to assess... - Björn Brembs

Bjorn - is daydreaming modulated by the DMN? - Jean-Claude Bradley

That's what people claim. I guess it's hard to put the correlation on a graph, as daydreaming is subjective. But the correlation with self-reports is striking. There is other evidence: in a repetitive task, increases in the normally suppressed DMN are predictive of errors or mistakes. - Björn Brembs