The effects of sleep deprivation on cognitive performance psychological variables related to cognitive performance were studied in 44 college students. Participants completed the Watson-Glaser Critical Thinking Appraisal after either 24 hours of sleep deprivation or approximately 8 hours of sleep. After completing the cognitive task, the participants completed 2 questionnaires, one assessing self-reported effort, concentration, and estimated performance, the other assessing off-task cognitions. As expected, sleep-deprived participants performed significantly worse than the nondeprived participants on the cognitive task. However, the sleep-deprived participants rated their concentration and effort higher than the nondeprived participants did. In addition, the sleep-deprived participants rated their estimated performance significantly higher than the nondeprived participants did. The findings indicate that college students are not aware of the extent to which sleep deprivation negatively affects their ability to complete cognitive tasks.
This study examined administration method (standard written administration vs. oral administration by an examiner) as a variable in influencing children's self-report test scores. Subjects included 139 students in grades 3-6, randomly assigned to one or the other administration condition. Subjects completed the Internalizing Disorders Evaluation Scale for Children (IDESC) according to the assigned administration method. Internal consistency estimates of each group were essentially similar. Mean IDESC scores of the two groups did not differ significantly from either a statistical or practical standpoint, based on 1-test and effect size calculations. Results suggest that method of administration did not affect test performance. Implications for child assessment and future research are discussed.
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