Abstract
Psychological and physiological effects of 18 kinds of colored lights were examined using a liquid crystal display in a dark environment (< 0.1 lx). The colored lights were characterized with the tones with various lightness and saturation, i.e., the colors named ‘dark’, ‘deep’, ‘vivid’, ‘bright’, ‘light’, and ‘pale’ in the Practical Color Co-ordinate System conditions. To investigate psychological and physiological effects, we used electroencephalography and a simple questionnaire. Subjective evaluations of ‘comfort’, ‘relaxation’, ‘awakening’, ‘tension’, and ‘anxiety’ were conducted using a five-level psychological preferences evaluation. Electroencephalographic and psychological evaluations revealed that the bright tone had a good effect for relaxation. Colored lights with ‘dark’ or ‘deep’ tone enhanced the degrees of tension and anxiety. As regards red and blue lights, ‘vivid’ tone with highest saturation enhanced the degrees of awakening.
