However, in the present study, the effect of interest was not whether the absolute amplitude of either the N2 or P3 components in the NoGo condition differed across groups. What was of interest was whether the inhibitory N2/P3 effect, i.e., the difference in response between Go and NoGo trails,was larger in one group relative to the other. Since the potential confounds of concern would be operative in both groups, they should not diminish the validity of group comparisons regarding the condition effects.