Anterior cingulate cortex
It appears to play a role in a wide variety of autonomic functions, such as regulating blood pressure and heart rate.
Posterior cingulate cortex
Considering the PCC's relation with the DMN, since suppressed posterior cingulate activity favors low cognitive introspection and higher external attention while increased activity indicates memory retrieval and planning, it has been hypothesized that this brain region is heavily involved in noticing internal and external changes and facilitating novel behavior or thought in response. High activity, then, would indicate continued operation with the current cognitive set, while lower activity would indicate exploration, flexibility, and renewed learning.