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participants. Data collection took place over a three-week period in Portland, OR from late-February to mid-March. Participants were scheduled at various times throughout the day and into the evening, but each came in at the same time each week. Participants completed the shortened SPAQ before their first session. POMS-SF and baseline heart rate were taken before each session. Heart rate was taken again 25 minutes into each session. The POMS-SF was administered again at the end of the session. After the POMS-SF was completed and heart rate was taken a final time, participants started the CCPT. The CCPT lasted approximately 10 minutes. Each session lasted a total of about 1 hour. 2.4 Data Analysis To assess the impact of the lighting manipulation on self-reported emotional states, scores on the POMS-SF were compared across the three lighting conditions via a one-way, repeated measures ANOVA. Differences in the physiological arousal as a function of lighting condition was assessed by converting the three heart rate measures into two composite scores (taking the difference between mid-session heart rate and pre- session heart rate as well as the difference between post-session heart rate and pre-session heart rate) and then entering these scores into a one-way, repeated measures ANOVA. In order to determine whether the different lighting conditions affected participants’ ability to sustain attention, four separate measures derived from the CCPT were compared across lighting conditions with one-way, repeated measures ANVOA: reaction times, miss rates for conjunction targets (omission errors), false alarm rates for non-targets that shared one feature with the target (feature commission errors), and errors rates for non- targets without any target features (non-feature commission errors). If there were significant differences across conditions in the ANOVAs, pairwise comparisons (t-tests) were used to determine the exact pattern of differences. 17PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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