The alcoholic group displayed lower power compared to controls in all frequency bands at all time-points for the Go as well as NoGo conditions at the midline parietal location (refer to respective TFR plots in Fig. 3b). Further, 2D surface Laplacian head-maps showed that for the Go condition, the control group had evoked delta power density localized bilaterally in centeroposterior regions whereas in the alcoholics, this density was localized bilaterally at posterior regions. For the NoGo condition, the control group showed localized power density in frontocentral regions whereas the alcoholic group showed this density localized in central regions. Regardless of the topographical similarities and differences shown, the alcoholics displayed much lower and region-restricted density of evoked delta compared to the controls for both Go and NoGo conditions.
