Qualitative comparison of mean P3 values for each subgroup during loss and gain conditions are illustrated in Fig. 3. Section 3.2 describes the statistical comparison of P3 amplitudes across factors with RM-ANOVA. Lower P3 amplitudes in HR compared to LR subjects (solid vs. broken lines within each panel in Fig. 3) was more evident in both younger and older male subjects only during the loss condition (top left panel), as well as in younger female subjects during both loss and gain conditions (orange lines in right-side panels). Further, a comparison between genders (left-side vs. right-side panels in Fig. 3), indicates that younger males during both loss and gain conditions showed higher P3 amplitudes than their female counterparts (cyan vs. orange lines). Furthermore, older subjects showed increased P3 amplitudes in anterior sites and a decrease in posterior regions compared to younger subjects (darker vs. lighter colored lines within each panel in Fig. 3), reflecting brain maturation during development (“frontalization”).
