Blue light and mood : the role of timing and duration of exposure characteristics and circadian type (original) (raw)

2018

Abstract

The goal of this article is to present the results of the experiment conducted to fi nd out if individual differences in circadian clock characteristics (circadian type) moderated timing and duration of exposure to blue light on mood. Circadian type measured by Circadian Type Inventory (DiMilia, Smith i Folkard, 2005) has two dimensions: languidity (languid - vigorous) and fl exibility (fl exible - rigid). 30 young men took part in counterbalanced repeatedmeasures experiment with blue and white light conditions emitted at three times of day (morning, afternoon, and evening). Mood was measured with Thayer’s Activation-Deactivation Adjective Check List after short (30 minutes) and prolonged (4 hours) exposure. Results showed that languidity moderated blue light effect in two characteristics of mood: tension and calmness. In blue light when compared to white light conditions languid types were tenser (in both short and prolonged exposure) and calmer after prolonged exposure than vigoro...

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