additional sets of analyses. Ancestry-informative principal component variables, generated using the Eigenstrat program (36), were included in the first step of the regression. In the second, we restricted analyses to individuals reporting Caucasian ancestry (see the online data supplement). All analyses were conducted on BOLD contrast estimates extracted from functional clusters exhibiting a significant main effect of task in the right and left amygdala. All predictor variables were mean centered before the analyses and computation of the interaction term.
