Cargando…

Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning

BACKGROUND: It is well known that exposure to light, especially of short wavelength, enhances human alertness during the nighttime. However, more information is needed to elucidate the effects of light wavelength on alertness at other times of day. The present study investigated how two narrowband l...

Descripción completa

Detalles Bibliográficos
Autores principales: Okamoto, Yosuke, Rea, Mark S, Figueiro, Mariana G
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3939638/
https://www.ncbi.nlm.nih.gov/pubmed/24568149
http://dx.doi.org/10.1186/1756-0500-7-113
_version_ 1782305721512099840
author Okamoto, Yosuke
Rea, Mark S
Figueiro, Mariana G
author_facet Okamoto, Yosuke
Rea, Mark S
Figueiro, Mariana G
author_sort Okamoto, Yosuke
collection PubMed
description BACKGROUND: It is well known that exposure to light, especially of short wavelength, enhances human alertness during the nighttime. However, more information is needed to elucidate the effects of light wavelength on alertness at other times of day. The present study investigated how two narrowband light spectra affected human alertness during the morning after awakening. We measured electroencephalography (EEG) during 48-minute exposure to narrowband short- and long-wavelength light and darkness in the early morning. RESULTS: Power densities of EEG during each light exposure were calculated. The time course of EEG power indicated that, compared with remaining in darkness, the power in the alpha frequency range (8–13 Hz) was significantly lower after approximately 30 minutes of exposures to both the short- and the long-wavelength light. CONCLUSIONS: These results suggest that not only short-wavelength light but also long-wavelength light, which does not suppress melatonin levels at night, can affect alertness in the early morning. These results suggest that the alerting effects of light in the early morning hours may be mediated by mechanisms other than those that are exclusively sensitive to short-wavelength light.
format Online
Article
Text
id pubmed-3939638
institution National Center for Biotechnology Information
language English
publishDate 2014
publisher BioMed Central
record_format MEDLINE/PubMed
spelling pubmed-39396382014-03-04 Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning Okamoto, Yosuke Rea, Mark S Figueiro, Mariana G BMC Res Notes Research Article BACKGROUND: It is well known that exposure to light, especially of short wavelength, enhances human alertness during the nighttime. However, more information is needed to elucidate the effects of light wavelength on alertness at other times of day. The present study investigated how two narrowband light spectra affected human alertness during the morning after awakening. We measured electroencephalography (EEG) during 48-minute exposure to narrowband short- and long-wavelength light and darkness in the early morning. RESULTS: Power densities of EEG during each light exposure were calculated. The time course of EEG power indicated that, compared with remaining in darkness, the power in the alpha frequency range (8–13 Hz) was significantly lower after approximately 30 minutes of exposures to both the short- and the long-wavelength light. CONCLUSIONS: These results suggest that not only short-wavelength light but also long-wavelength light, which does not suppress melatonin levels at night, can affect alertness in the early morning. These results suggest that the alerting effects of light in the early morning hours may be mediated by mechanisms other than those that are exclusively sensitive to short-wavelength light. BioMed Central 2014-02-26 /pmc/articles/PMC3939638/ /pubmed/24568149 http://dx.doi.org/10.1186/1756-0500-7-113 Text en Copyright © 2014 Okamoto et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
spellingShingle Research Article
Okamoto, Yosuke
Rea, Mark S
Figueiro, Mariana G
Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning
title Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning
title_full Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning
title_fullStr Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning
title_full_unstemmed Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning
title_short Temporal dynamics of EEG activity during short- and long-wavelength light exposures in the early morning
title_sort temporal dynamics of eeg activity during short- and long-wavelength light exposures in the early morning
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3939638/
https://www.ncbi.nlm.nih.gov/pubmed/24568149
http://dx.doi.org/10.1186/1756-0500-7-113
work_keys_str_mv AT okamotoyosuke temporaldynamicsofeegactivityduringshortandlongwavelengthlightexposuresintheearlymorning
AT reamarks temporaldynamicsofeegactivityduringshortandlongwavelengthlightexposuresintheearlymorning
AT figueiromarianag temporaldynamicsofeegactivityduringshortandlongwavelengthlightexposuresintheearlymorning