(a) Statistical parametric map illustrating significantly less fear-related amygdala reactivity in FAAH 385A carriers in comparison with C385 homozygotes (right amygdala: 22, −1, −20; Z = 2.83, P = 0.029, 34 voxels; left amygdala: −20, 1, −17; Z = 2.47, P = 0.049, 18 voxels). (b) Mean (±SEM) fear-related amygdala reactivity from maximum voxel in the right amygdala cluster from (a) in arbitrary units (AU) as a function of FAAH genotype (F(1,79) = 8.46, P = 0.005).