Therefore, based on the observed topographical contributions of different frequencies, their functional relevance, and their group and condition differences in the current study as well as the previous literature, it may be concluded that alcoholics manifest neurocognitive processing deficits compared to controls that involve both activation and inhibition processes. These deficits are more pronounced in the frontocentral regions for the slower frequency bands (e.g., delta and theta) that have traditionally been found to be associated with the activation aspects of higher order complex cognitive processing involved in decision making and adaptive control of behavior. Furthermore, it appears that only evoked fast alpha power reliably reflects the early attentional component of inhibitory processing (suppression of a motor response for the NoGo condition), as well as its deficits in alcoholics. On the other hand, evoked slow alpha power reflects the relative contributions of the anterior regions while suppressing (inhibition) a motor response.
