single motor response was to be executed or withheld. Support for the conflict monitoring view gets further strengthened by the sLORETA finding of significantly larger NoGo differential current density in the N2 time-range at the ACC regions in both groups, which have strongly been suggested to be involved in conflict monitoring and effortful processing (Bekker et al., 2005; Botvinick et al., 2004; Ridderinkhof et al., 2004a; Ridderinkhof et al., 2004b) rather than inhibition, which have more often been associated with the activation of dorsolateral prefrontal cortex (DLPFC), inferior prefrontal cortex (IFC), or orbitofrontal cortex (OFC; Simmonds et al., 2008, see for a review Aron et al., 2004).
