2.70; SE = 0.02). Genotype × region interaction effect indicated that theta differences between genotypes (GG > AA) were significant in central (2.84 > 2.71) and parietal (2.88 > 2.72) but not in frontal region (2.73 vs 2.68). Genotype × region interaction effect also revealed that theta power significantly varied between the regions (frontal vs. parietal) in each genotype group. Condition × region effect for theta power had a posterior maximum (parietal > central > frontal <=> 2.87 > 2.82 > 2.69) for gain (p < 0.001) and a topographic pattern that was not significant during loss (2.71 vs 2.71 vs 2.72). However, genotype × condition and genotype × condition × region interaction effects were not significant.
