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14 be just as psychologically valid as the original and even has better psychometric properties on a few of the sub-scales (Curran, Andrykowski, & Studts, 1995). 2.2.2 Seasonal Pattern Assessment Questionnaire A shortened version of the Seasonal Pattern Assessment Questionnaire (SPAQ) was used to assess if participants had symptoms of Seasonal Affective Disorder (SAD) and was administered before the participants’ first session. The shortened measure uses two questions to assess a person’s Global Seasonality Score and identify possible SAD or sub-threshold SAD. Although on the original measure there are more questions, only the two questions we employed are actually used to calculate the Global Seasonality Score. The measure is imperfect, known for over diagnosis, but was used as a rough estimate of susceptibility to SAD. 2.2.3 Heart Rate Participants’ heart rate was taken as a measure of physiological arousal. Heart rate was checked three times; once pre-session, once during exposure to the light (detailed more in section 2.3), and once after exposure to the light, but before subjects began the attention task. Heart rate was assessed over two-minute periods and the average of each time period was taken. Pre-session heart rate was taken after the administration of the POMS-SF in order to ensure that participants’ heart rate was not elevated from prior activities. The heart rate measuring device was an Air Wireless Pulse Oximeter (iHealth). 2.2.4 Sustained Attention Task A visual Conjunctive Continuous Performance Task (CCPT) was used to measure participants’ ability to sustain attention. This task is similar to the Continuous Performance Task (CPT). The CPT is a simple task in which participants respond to a single letter or number stimulus (such as the letter “X,” or the number “1”) by pressing a button while ignoring all other stimuli (the other 25 letters of the alphabet, or the digits 2- 10, respectively) when they appear on the screen (Riccio, Reynolds, Lowe, & Moore, 2002). Stimuli appear one at a time for 100 msec, with 1900 msec between each stimulus,PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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