| Abstract: | According to Eysenck's theory introverts, because they are cautious or low in impulsivity, should fulfill their mandatory experimental credit hours by volunteering for experiments early in the semester while extraverts should wait until the last minute. Data collected during the 5th and 15th week of the semester and after the semester was completed provide modest support for the hypothesis. Extraversion scores for the last session were significantly higher than the prior four sessions in an a priori contrast (t = 3.48, df = 152, P < 0.001) but scores from the 15th week while higher than the 5th, were not significantly higher (t = 1.30, df = 152, P = 0.20). |
