Time-frequency (TF) plots and head maps of theta power across the genotypes during loss and gain conditions are shown in Fig. 4. There is an additive effect of genotypes [GG > AG > AA] with increasing theta power corresponding to the number of minor allele(s) during evaluation of loss as well as gain in central and parietal regions illustrating the effects shown in Fig. 3. Subtle topographic differences across genotypes manifested as gradual and relative increases of posterior theta power (i.e., minor allele(s) contributing to posteriorization of theta power). The ERP waveforms and P3 topography revealed a similar (but less robust) finding that the group with minor allele(s) displayed higher P3 amplitude compared to the group homozygous for the major allele [GG/AG > AA], prominently at the posterior region, during the evaluation of loss as well as gain (see Fig. A1 in Appendix).
