In a study of the effect of fatigue on task performance,participants were asked to complete a series of puzzles.One day,all participants completed puzzles after 24 hours without sleep.On another day,the same participants completed puzzles after sleeping for at least eight hours.What research design is used in this study

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This study uses a within-subjects design, as the same participants completed the task under two different conditions (after 24 hours without sleep and after sleeping for at least eight hours). This allows for each participant to serve as their own control, increasing the power of the study and reducing the impact of individual differences between participants.

In a Study of the Effect of Fatigue on Task