“…C957T is also likely to be in linkage disequilibrium with Taq1A polymorphism of ANKK1 gene (Frank & Hutchison, 2009). What is more, DRD2 affects other aspects of behavior not investigated in this study, such as reward, addiction (Volkow, Fowler, Wang, & Swanson, 2004) and impulsivity (White, Lawford, Morris, & Young, 2009), suggesting that the effect of C957T on behavior and its interactions with other gene polymorphisms and environmental stressors are more complex than observed in this study. We also acknowledge that a subset of the participants may have been experiencing current adversity, and a small number of individuals ( n = 6) reported a history of mental health disorder, but these participants were not disproportionately distributed between genotype groups and it is therefore unlikely that these cases were driving the significant effects seen in our study.…”