| Sumario: | A study was conducted to determine whether differences exist between students who volunteer for research credit at the beginning of the college semester and students who postpone their research participation until the end of the semester, in light of the fact that external validity might be threatened when researchers take samples from university participant pools. Point-of-time effects were examined by means of measures of procrastination, motivation, locus of control, and cued recall. Results suggested that slight differences exist between early and late volunteers on some measures of personality and motivation, but no point-of-time effects were observed for cued recall. The findings further revealed that if performance-based measures such as cued recall are being examined, potential differences in personality and motivation might be attenuated because of the demand characteristics of laboratory settings.
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