conditions. For the Condition × Region interaction effects, the largest NoGo N2 amplitude was found at frontal regions, whereas Go N2 amplitudes were found to be largest at central regions. Further, NoGo N2 amplitudes were found to be significantly larger than Go N2 at frontal regions (t (669) = 6.56, p < .0001), whereas Go N2 amplitudes were significantly larger at all posterior regions. The central region manifested larger NoGo N2 amplitudes than Go N2; however, this difference was not statistically significant. Although the three-way interaction (Group × Condition × Region) effects were not found to be statistically significant at the < .05 level, the F ratio value (F (5, 669) = 2.16, p = .057) was close to the significance level. In keeping with this observation, coupled with the regional specificity of the directional nature of the condition differences as well as the number of factors involved (2 × 2 × 6), post hoc exploration of the pair wise comparison was performed for the Group × Condition × Region as well. On Wald's test, the significant differences between Go and NoGo N2 amplitudes were observed at all except central regions in control and at all except frontal regions in
