Experimental procedures
Participants were tested between 12:20 and 18:45 to control for the diurnal rhythm of cortisol. They were instructed to arrive well-rested, limit themselves to light physical exercise on the day of the experiment, and avoid the use of alcohol and other psychoactive substances starting the day prior to the experiment. Participants were asked to have a light meal roughly 2 h before the experiment and avoid food and drink intake (except water) in the 30 min leading up to the experiment.After arrival, participants answered questionnaires assessing current mood (MDBF; Steyer et al. After baseline measurements, participants performed a risk-taking task, the Balloon Analogue Risk Task (BART; Lejuez et al. Approximately 65 min after medication intake, participants began the AACT (average duration: 42 min), followed by final saliva sample, vital signs, and mood assessments (T5). Finally, participants indicated which pharmacological intervention they believed to have received and were debriefed about study procedures. The experiment lasted about 2 h and 40 min.