or without controlling effects of psychological variables (scores on the BDI-II, BAI, and BIS-11) were analyzed separately for each frequency band. Effects of demographic data (age, education, and IQ) variables were controlled in all conditions. Bonferroni correction was applied to the post hoc analysis, and the significance level was set at 0.0167. Fisher’s Z-transformed scores were used for the EEG data. The group factor consists of IGD (n = 30), AUD (n = 30), and HC (n = 32). The region factor consists of following pairs: fronto-central, fronto-temporal, fronto-parietal, centro-temporal, centro-parietal, temporoparietal. The hemisphere factor consists of left and right side. EEG = electroencephalography; IGD (I) = Internet gaming disorder; AUD (A) = alcohol use disorder; HC (H) = healthy control; IQ = intelligence quotient; BDI-II = Beck Depression Inventory-II; BAI = Beck Anxiety Inventory; and BIS-11 = Barratt Impulsivity Scale-11. There were no significant group or group × region effects in the delta or alpha bands (all P-values > 0.0167) or significant group × region effects in the theta, beta, or gamma bands (all P-values > 0.0167). Interhemispheric coherence without controlling for the effects of the psychological characteristics Analyses of interhemispheric coherence while controlling for the effects of the
