Eighteen young healthy volunteers (13 males, five females; age range: 20–30 years) were monitored during a measurement protocol consisting of three experimental conditions corresponding to different levels of mental stress (Zanetti et al., 2019a):

The three above-described conditions actually correspond to an increasing level of stress, since a sustained attention task produces higher mental involvement than a fully relaxed state, still not being as stressful as carrying out fast and continuous arithmetic calculations (Zanetti et al., 2019a).

The experiment was approved by the Ethics Committees of the University of Trento. All volunteers participating in this study provided written informed consent. Further details on the measurement protocol employed for this study can be found in Zanetti et al. (2019a).

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