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spectrum, white light), blue light (40 lux, 450 nm light), and a control light (40 lux, warm incandescent light). In each lighting condition, emotional state was assessed via the Profile of Mood States-Short Form (POMS-SF). To measure a key aspect of cognitive functioning, subjects’ ability to sustain attention on a task was measured with a Conjunctive Continuous Performance Task (CCPT). Intermittent measurements of heart rate were taken to assess the impact of the lighting condition on an aspect of basic physiology, known to be related to stress (Thayer, Åhs, Fredrikson, Sollers, & Wager, 2012). The Seasonal Pattern Assessment Questionnaire (SPAQ) was also administered as an exploratory co-variate, in case subjects’ reactions to the different lighting conditions varied as a function of having SAD. All measures are relayed in more detail in section 2.2. 1.4.2 Hypotheses Based on previous studies we predicted that scores on the POMS-SF would be lower in the light therapy and blue light conditions compared to the control condition since there is evidence that both bright white light and blue light are effective for treating SAD. Lower scores on the POMS-SF indicate a lower Total Mood Disturbance, and, thereby, a better mood. For the CCPT, we expected that error rates would increase, and reaction times would take longer in the light therapy condition compared to the blue light and control conditions, because of the bright SAD lamps’ potential to distract and irritate participants. Similarly, heart rate was expected to increase in the light therapy condition relative to the two other conditions because of the potential for bright lights to increase arousal and physiological stress. 9PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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