Error processing and conflict monitoring are executive functions that were associated with neural activation in the dorsomedial prefrontal cortex and specific event-related potentials (ERN, N2). My colleague Reto Iannaccone studies the neural correlates of error processing and conflict monitoring using simultaneous EEG-fMRI to unite the EEG-components with the fMRI activation patterns.
Iannaccone R, Hauser TU, Staempfli P, Walitza S, Brandeis D & Brem S (2015). Conflict Monitoring and Error Processing: New Insights from simultaneous EEG-fMRI. NeuroImage 105: 395-407.