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Outgroup members are often perceived as threating and untrustworthy, and this is particularly true for judgments of outgroup males. As race influences perceptions of group membership, male racial outgroup faces (MROFs) are judged as less trustworthy than male racial ingroup faces (MRIFs). Neurologically, this effect is mediated by amygdala activation, a brain region central to the processing of fear-related stimuli, threat detection, vigilance regulation and facial trustworthiness. As acute stress up regulates amygdala activity and promotes hyper-vigilance towards threatening stimuli, we hypothesised that acute stress would result in increased vigilance and lower trustworthiness judgements towards MROFs. In contrast, we expected that stress would have no effect on MRIFs. Using a within-subjects design, White-Dutch male participants rated the perceived trustworthiness of White males (ingroup) and Arab …