Revisiting the SECPT-G: A template for the group-administered socially evaluated cold-pressor test to robustly induce stress

The Socially Evaluated Cold-Pressor Test (SECPT (Schwabe et al., 2008) [1]; reliably elicits stress responses. We refined the group-administered version of the SECPT (SECPT-G) aiming to increase its' effectiveness. In Experiment 1 (N = 39), we gathered data from 12 participants simultaneously, employing a stress confederate for each participant. In Experiment 2 (N = 69), we gathered data from six participants simultaneously, employing either six stress confederates (individual-observation) or a single one (group-observation). In Experiment 1, we found that the SECPT-G elicited cortisol responses compared to a control condition; in Experiment 2, we replicated these findings and observed that cortisol responses were similar in the individual- and the group-observation setting. The findings of Experiment 2 were corroborated by people's subjective stress experience. Importantly, both experiments show a similar magnitude of cortisol response, and a greater responder rate than in the regular SECPT or the regular Trier Social Stress Test (TSST). The presented SECPT-G template may thus serve as a reliable and efficient stress induction tool that allows standardization across research groups.