Fig. 1.

Interactions of 5-HTTLPR genotype and quality of contact with outgroups on intergroup bias. For each of the comparisons below, a genotype x quality of contact interaction was observed, such that greater negative quality of prior contact with an outgroup was more predictive of intergroup bias among the S-group compared with the L/L-group. Negative contact (x-axis) is represented in Z-score values. Dots reflect participant scatter plot data. Lines reflect simple slopes for the interactions at low (−1 s.d.) and high (+1 s.d.) levels of negative contact.