tested the effects of bright light on reaction time. In that study all the participants were tested under two sleep conditions; they were sleep deprived and rested. They were also tested under dim light and bright light. In other words, the study that this assignment is based on was a repeated measures design; however, it can be done as a mixed design. Participants’ reaction time was assessed using a psychomotor vigilance test under both dim and bright light following sleep deprivation and a period of regular sleep. The study you design (and hypothetically run) will also be a 2 x 2 factorial design, but you can decide if your design a mixed factorial design or a repeated measures design. If you choose a mixed design, the between factor must be the sleep condition, and the within factor would be the light intensity (you need to specify this in your assignment). The dependent variable is reaction time. Your hypothetical study will test three hypotheses: The main effect for light intensity, the main effect for sleep condition, and the interaction.
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