<qa>  What was the duration of the experimental sessions?Experimental Sessions The participants were told to avoid the intake of alcohol and caffeine in the 24 hours prior to the experimental sessions. In addition, for this same period, the participants were asked to not perform moderate or vigorous physical activity. The experimental sessions were performed in random order and were separated by a period of seven days each, from 9 to 10 am. All sessions were performed on days the professor taught class, which occurred during the universitys night period, between 7 and 10 pm. In the three experimental sessions, the professor taught the same class and the same subject. 