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Discussion According to the results, neither mood, heart rate, nor attention were significantly affected by each lighting condition. This pattern of results suggests that either there is not an effect of lighting condition on these specific psychological constructs, or that flaws in the study prevented reproduction of previously reported effects. Potential flaws include but are not limited to: effect sizes that were too small to be captured with a small sample size (N=11), experimental procedures that were not sensitive enough or flawed in some way, or extraneous variables that affected the quality of the data. A few trends in the data do appear to hint at preliminary support for certain hypotheses. These trends were evident for the reaction times and omission error measures of the sustained attention task (CCPT). 4.1 Limitations 4.1.1 Limitations of the Current Study There were a number of possible limitations that could have possibly affected the outcome of this study, including sample size and confounding variables such as effect size, weather, time of day, and the time in the semester in which this study took place. 4.1.1.1 Sample Size With only 11 participants it is possible that there was simply not enough statistical power to detect genuine differences between the three lighting conditions. It is important to note that there were times when the results followed the expected pattern numerically, although the variability resulted in statistically indistinguishable differences. This was true of the average of the reaction times for the CCPT as well as for the omission errors for the CCPT, where, as predicted, the SAD condition showed less of a propensity toward paying careful attention, with longer reaction times and more omission errors.PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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