p = 0.0003]. On the other hand, age group × region interaction effect showed that while the difference in theta power between the younger and the older age group was significant in all four regions (younger > older), the highest age difference was observed in the occipital region [younger = 3.26 (0.02); older = 2.79 (0.03); F = 194.06; p < 0.0001], followed by parietal [younger = 3.32 (0.02); older = 2.87 (0.03); F = 160.56; p < 0.0001], central [younger = 3.22 (0.02); older = 2.86 (0.03); F = 103.91; p < 0.0001], and frontal region [younger = 3.14 (0.02); older = 2.79 (0.03); F = 100.49; p < 0.0001]. The pairwise comparisons, shown in Fig 3 [panel sets C1 and C2], revealed that age differences in theta power were highly significant (younger > older) within each gender and risk group during the loss as well as the gain condition, and that these differences were more robust in males compared to females.
