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28 4 3.5 3 2.5 2 1.5 1 0.5 0 Commission Errors SAD Control Blue Figure 14: Commission Errors in the CCPT by Light Condition The figure shows the percentage of commission errors on the Conjunctive Continuous Performance Task across three lighting conditions. Percentage of commission errors was found by combining false hit rates for non-target stimuli that shared one feature with the target, either its color (red) or shape (square) and converting those rates into a percentage. The lighting conditions included one bright, white light (SAD), one dim, warm light (Control), and one dim, blue light (Blue). The error bars reflect the standard error of the mean. A one-way ANOVA indicated that commission errors were not significantly different across light condition, F(2,10) = 0.9, p=.42. Although not statistically significant, when the data is visualized, there is a numeric pattern that contrasts the other three CCPT measures. This graph shows a similar false-hit rate in both the SAD light condition as well as the blue light condition (means: SAD = 2.79; Control = 1.91; Blue =2.79). It is possible that the reason for this discrepancy is that color discrimination, which was necessary for this task, could have been more difficult in the blue light condition because of the after-image left following the exposure to the blue light for 45 minutes. Percentage of Commission Errors in the CCPTPDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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