Taken together, on the basis of the current literature, it appears that two areas in the frontal cortex are identified as being responsible for the generation of N2 while performing a Go/NoGo task: namely, medial frontal regions including ACC, and right inferior prefrontal regions. The activation of the medial frontal region, specifically ACC, is said to be involved in conflict detection, whereas the activations of the right inferior prefrontal region is said to reflect response inhibition. The traditionally reported NoGo N2 “effect” as being due to inhibition (e.g., Jodo and Kayama, 1992) gets support from findings of substantial right dorsal and ventral prefrontal activity for NoGo trials (e.g., Bokura et al., 2001; Buchsbaum et al., 2005), whereas there is growing evidence in support of the conflict monitoring explanation (e.g., Nieuwenhuis et al., 2003) from findings of possible cortical neural generators of N2 involving ACC regions (Nieuwenhuis et al., 2004; van Veen and Carter, 2002). A related interpretation of N2 supports the notion of selecting to execute or inhibit an appropriate response (Simmonds et al., 2008), whereas the NoGo P3 “effect”
