Figure 2.

(A) Illustration of response accuracy for the different genotype groups of the DRD1 (rs4532) single nucleotide polymorphism (SNP). G allele carriers (AG&GG) showed a smaller performance difference between the easy and hard task than homozygous A allele carriers (AA) (right graph). This performance difference was mainly driven by higher accuracy in the hard task for the AG&GG group compared to the AA group. (B) Illustration of response accuracy for the different genotype groups of the DRD2 (rs6277) SNP. There were no accuracy differences between the 3 genotype groups (CC, CT, and TT) in the easy task or the hard task. Error bars indicate SEMs, and significant group differences are denoted with asterisks (**P < .001).