As evidenced in Fig. 4a, Go evoked theta power was higher overall than NoGo evoked theta at all except frontal regions in the control group, where power density was found to be highest at the central region for the Go and at the frontal region for the NoGo condition. Furthermore, NoGo evoked theta power was higher overall than Go at all regions in the alcoholic group, where power density was found to be highest at the occipital region for both task conditions. However, no significant condition differences were found in either group at any of the six scalp regions (Fig. 4a, top panels). The alcoholic group displayed lower evoked theta power compared to the control group at all regions, regardless of condition; this lower evoked theta power in alcoholics compared to controls was statistically significant for the Go condition at frontal, central, and parietal regions (Fig. 4a, bottom left panel) and for the NoGo condition at frontal and central regions (Fig. 4a, bottom right panel).
