In the present study, axillary sweat served as the anxiety signal and was collected from 49 students (28 males) while awaiting an oral examination at the university. The chemosensory control stimulus was composed of a sweat sample from the same participants while participating in an ergometer training. Upon completion of collection, all sweat samples were pooled with regard to the respective donation conditions and the donor's sex. Each of the four final homogenized samples was divided into small portions of 0.4 g and stored at −20°C. For the EEG data recording, the small portions were filled into the glass bottles of the olfactometer and renewed after each experiment. In detail, the sweat donors and the sampling procedure are described elsewhere [11].
