Is stress colorblind? Exploring endocrine stress responses in intergroup contexts using a virtual reality-based Trier Social Stress Test (TSST-VR)

Are social stress reactions dependent on the group identities of interaction partners? This study explored the role of ethnic context in modulating endocrine stress responses using a virtual reality (VR)-based adaptation of a standardized stress induction protocol, the Trier Social Stress Test (TSST-VR). Previous research found no clear link between endocrine stress response and ethnic context in the TSST, but conclusions remain limited due to the quasi-experimental nature of manipulating ethnic context in real-life face-to-face interactions. The VR adaptation of the TSST circumvents quasi-experimental limitations and thus provides a first, randomized-controlled investigation of the effects of ethnic context on endocrine stress responses. Forty-three men participated in the study, facing either an ingroup ("White") or an outgroup ("Arab") panel of interviewers. As expected, the TSST-VR produced physiological and subjective stress reactions. However, endocrine stress reactions occurred independent of interviewer ethnicity and could not be predicted based on implicit bias, explicit prejudice, or prejudice-related appearance concerns. Other physiological and subjective stress reactivity parameters also remained comparable across intergroup conditions. Implications for stress research are discussed.