FAAH and post-traumatic stress disorder: In a study investigating fear conditioning in PTSD individuals, the FAAH C385A allele was associated with higher initial skin conductance responses to the conditioned stimulus (CS+), as well as increased physiological arousal to the conditioned stimulus that had not been paired with the aversive stimulus (CS‐), which suggests that there may have been fear generalization (Ney, Matthews, et al., 2021).