In conclusion, the BD and non-BD groups showed no significant differences in terms of theta, lower-alpha, or upper alpha activity. Concerning FC, the BD group exhibited significantly stronger theta coherence than that of the non-BD group. In terms of the lower and upper alpha bands, the BD group showed stronger connectivity in some areas but weaker coherence in others compared with the non-BD group. Also, the BD group exhibited significantly poorer performance on the delayed recall condition of the RCFT than that of the non-BD group, and a positive correlation between connectivity of the upper alpha band and performance on the delayed recall of the RCFT was observed only in the BD group. Spectrum analysis reflects the characteristics of the local brain area, whereas FC reflects the interaction among different areas. Therefore, the results of the present study indicate that BD can produce detrimental effects on the transmission of information among various areas of the brain, and this effect seems to be related to the visual memory deficits observed in binge drinkers.
