Statistical analysis yielded significant main and interaction effects (Table 3). For the N2 amplitude, all main and interaction effects except age, age2, and three-way interactions were found to be highly significant (Table 3). Post hoc analyses of the significant interaction effects revealed significant pair wise differences. For the Group × Condition interaction effects, alcoholics showed reduced N2 amplitudes compared to controls for both Go (t (134) = -5.22, p < .0001) and NoGo (t (134) = -7.21, p < .0001) conditions, whereas Go N2 amplitudes were larger than NoGo N2 in both alcoholic (t (134) = -22.49, p < .0001) and control (t (134) = -13.21, p < .0001) subjects, regardless of regions. Further, alcoholics showed reduced N2 amplitudes compared to controls at all six regions (F (5, 670) = 8.49, p < .0001; Group × Region), regardless of task 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
