Impact of daytime spectral tuning on cognitive function

Article


Lok, Renske, Joyce, Daniel S. and Zeitzer, Jamie M.. 2022. "Impact of daytime spectral tuning on cognitive function." Journal of Photochemistry and Photobiology, B: Biology. 230. https://doi.org/10.1016/j.jphotobiol.2022.112439
Article Title

Impact of daytime spectral tuning on cognitive function

ERA Journal ID2243
Article CategoryArticle
AuthorsLok, Renske, Joyce, Daniel S. and Zeitzer, Jamie M.
Journal TitleJournal of Photochemistry and Photobiology, B: Biology
Journal Citation230
Article Number112439
Number of Pages9
Year2022
PublisherElsevier
Place of PublicationNetherlands
ISSN1011-1344
1873-2682
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jphotobiol.2022.112439
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S1011134422000537
Abstract

Light at night can improve alertness and cognition. Exposure to daytime light, however, has yielded less conclusive results. In addition to direct effects, daytime light may also mitigate the impact of nocturnal light exposure on alertness. To examine the impact of daytime lighting on daytime cognitive performance, and evening alertness, we studied nine healthy individuals using a within subject crossover design. On four visits, participants were exposed to one of four lighting conditions for 10 h (dim fluorescent, room fluorescent, broad-spectrum LED, standard white LED; the latter three conditions were matched for 100 lx) followed by an exposure to bright evening light. Cognitive performance, subjective and objective measures of alertness were regularly obtained. While daytime alertness was not impacted by light exposure, the broad-spectrum LED light improved several aspects of daytime cognition. The impact of evening light on alertness was not mitigated by the pre-exposure to different daytime lighting conditions. Results suggest that daytime exposure to white light with high melanopic efficacy has the potential to improve daytime cognitive function and that such improvements are likely to be direct rather than a consequence of light-induced changes in alertness.

KeywordsLight; Cognition; Sleep; Circadian; Human; Melanopsin; Alertness; Memory
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020520203. Cognitive neuroscience
529999. Other psychology not elsewhere classified
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Byline AffiliationsStanford University, United States
University of Nevada, United States
VA Palo Alto Health Care System, United States
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