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2.1 Participants Methods Participants were twelve 19-22-year-old students from Reed College who were recruited using social media posts and word of mouth (6 female, 2 non-binary, 2 non- binary women, 2 male). One subject only completed one session and, as a result, was excluded from analysis. As a result, the final data set included eleven participants. Participants were compensated for their time with “lottery tickets” that gave them the chance to win $50. Those who had color deficiencies were excluded from the experiment because color discrimination was essential for the sustained attention task. Participants were advised that if they had a light sensitivity that they may find the sessions uncomfortable and should consider withdrawing from the study. Although 63% of the participants reported feeling at least some change between seasons, only 27% of the participants met the minimum requirements for possible SAD according to the SPAQ. 2.2 Measures 2.2.1 Profile of Mood States-Short Form The Profile of Mood States-Short Form (POMS-SF1) was used to assess emotional state both pre- and post-session (Shacham, 1983). The POMS-SF contains five subscales: Depression-Dejection, Confusion, Tension, Anger, Fatigue, and Vigor. Total mood disturbance is found by adding the scores of the sub scales and subtracting the Vigor score. The measure uses a five-point Likert scale and a list of 37 adjectives that participants mark on a scale from “not at all” to “extremely.” The POMS-SF was originally derived from the POMS for cancer patients who may have found it difficult to complete the full, 65 adjective version of the POMS. This briefer scale has been shown to 1 Available in the AppendixPDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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