Participants
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Twenty healthy participants (15 male) with a mean (±SD) age of 22.9 (±5.17) were recruited. They had a mean weight (± SD) of 74.9 (± 14.2) kg and 14.5 (±1.5) years of education. Substance use information was unavailable for one participant: 13 of the participants were regular consumers of caffeinated drinks; 8 of them had used cannabis at least once (6 of them used it in the last two weeks); 11 of them consumed amphetamine at least once in their life (3 of them consumed in the last one year, while 2 of them consumed it in the last three months). None of them were active cigarette smokers (only three of them smoked a month ago).