Effects of Monochromatic Light on Electroencephalogram and Pupillary Reaction

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  • 脳波と瞳孔反応に対する単波長光の影響
  • ノウハ ト ドウコウ ハンノウ ニ タイスル タンハチョウ ヒカリ ノ エイキョウ

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Light causes acute physiological responses, including an arousal reaction, in humans. The authors of a recent study reported that the wavelength of light influence melatonin suppression and light exposure phase shifting during the night Few studies about alerting effects of light during the daytime in humans have been conductecL In the present study, we clarified the effect of light wavelength on the arousal level and pupillaiy reaction during the daytime on ten young male subjects (23±2.9yrs). Monochromatic light was transmitted through six types of filter to produce six different wavelengths (420,458, 500, 550, 610, 670 nm). The AAC (alpha attenuation coefficient) was apparently higher atthe 458-nm wavelength than at the other wavelengths. We estimated that the subjects' arousal level was increased during the exposure to the 458-nm wavelength in the daytime. The interaction between the light condition and the time was significant in relation to the change of pupil diameter. We also found that alter 16 minutes of light exposure, pupil diameter at 670 nm was largerthan at the other wavelengths.

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