Daytime Effect of Monochromatic Blue Light on EEG Activity Depends on Duration and Timing of Exposure in Young Men

Irena Iskra-Golec , Krystyna Golonka , Mirosław Wyczesany , Lawrence Smith , Patrycja Siemiginowska , Joanna Wątroba


Growing evidence suggests an alerting effect of monochromatic blue light on brain activity. Little is known about the moderation of those effects by timing and duration of exposure. The present electroencephalography (EEG) study examined such moderations on delta, theta, alpha1, alpha2, and beta EEG bands. A counterbalanced repeated-measures design was applied. The 16-hr day-time period was divided into three sessions: 07:00-12:20, 12:20-17:40, and 17:40-23:00 (timing of exposure). Two light conditions comparable in luminance but differing in wavelength were applied, namely polychromatic white light and monochromatic blue light (460 nm). There were two durations of exposure—the shorter one lasting 30 min and the longer one lasting 4 hrs. Thirty male students participated in the study. Four factors analyses of variance (ANOVAs, for light conditions, timing of exposure, duration of exposure, and brain area) were performed on each EEG band. Results indicated an alerting effect of short exposure to monochromatic blue light at midday and in the evening, which was demonstrated by a decrease in lower frequency bands (alpha1, delta, and theta, respectively). Long exposure to blue light may have a reverse effect, especially in the morning and at midday, when increases in lower frequency bands (theta in the morning and theta and alpha1 at midday) were observed. It can be concluded that the daytime effect of monochromatic blue light on EEG activity depends on timing and duration of exposure.
Author Irena Iskra-Golec (Wydział Zamiejscowy w Poznaniu)
Irena Iskra-Golec,,
- Wydział Zamiejscowy w Poznaniu
, Krystyna Golonka
Krystyna Golonka,,
, Mirosław Wyczesany
Mirosław Wyczesany,,
, Lawrence Smith
Lawrence Smith,,
, Patrycja Siemiginowska
Patrycja Siemiginowska,,
, Joanna Wątroba
Joanna Wątroba,,
Journal seriesAdvances in Cognitive Psychology, ISSN 1895-1171, (A 20 pkt)
Issue year2017
Publication size in sheets0.5
Keywords in Englishblue light, timing, duration, EEG bands
ASJC Classification3205 Experimental and Cognitive Psychology
Languageen angielski
Iskra-Golec_Daytime_all_2017.pdf 332.74 KB
Iskra-Golec_Daytime_osw_2017.JPG 1.79 MB
Score (nominal)20
Score sourcejournalList
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 0.708; WoS Impact Factor: 2017 = 1.452 (2) - 2017=1.862 (5)
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