The voxel-by-voxel t-statistics comparisons between genders and outcomes identified several brain regions (see Fig. 9). Gender differences were more evident in −50 and +50 conditions, especially for the ORP component. In the ORP component during −50 and +50 conditions, females activated right temporal pole (BA-38) more than males, while males had increased activity at bilateral occipital areas (BA-17 & 18). In the ORN activity during the −50 condition, females had increased acticity at bilateral superior frontal gyrus (BA-6) than males. During the +50 condition, males had increased ORN activity at left angular gyrus (BA-39) while females had increased activity at right angular gyrus and supramarginal gyrus (BA-39 & 40) and left paralimbic temporal area (BA-38). Robust diffences in valence (loss vs. gain) were also found. In both male and female groups, loss had more anterior activation and gain had more posterior (parietal) activation in ORN as well as ORP components. In terms of differential processing for amount (50 vs. 10), increased frontal activity of the 50 condition (relative to the 10 condition) was observed only in females.
