| Sumario: | A study was conducted to examine character differences between students who volunteer to participate in psychological studies in class and those who volunteer to participate after class. Data were drawn from 566 male and female college students from introductory psychology courses who completed the Constructive Thinking Inventory either in class or after class. Results revealed that in-class male and female volunteers produced significantly more internally invalid data than did the after-class volunteers. Moreover, compared to in-class volunteers, the after-class volunteers appeared to have better developed behavioral-coping skills, more optimistic perceptual styles, stronger opinions, and greater tolerance for others. It is concluded that these findings raise new validity issues about studies that consider these student groups as part of the same population.
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