Light, alertness, and alerting effects of white light: A literature overview

Renske Lok, Karin C. H. J. Smolders, Domien G. M. Beersma, Yvonne A. W. de Kort

OnderzoeksoutputAcademicpeer review

38 Citaten (Scopus)
273 Downloads (Pure)


Light is known to elicit non-image-forming responses, such as effects on alertness. This has been reported especially during light exposure at night. Nighttime results might not be translatable to the day. This article aims to provide an overview of (1) neural mechanisms regulating alertness, (2) ways of measuring and quantifying alertness, and (3) the current literature specifically regarding effects of different intensities of white light on various measures and correlates of alertness during the daytime. In general, the present literature provides inconclusive results on alerting effects of the intensity of white light during daytime, particularly for objective measures and correlates of alertness. However, the various research paradigms employed in earlier studies differed substantially, and most studies tested only a limited set of lighting conditions. Therefore, the alerting potential of exposure to more intense white light should be investigated in a systematic, dose-dependent manner with multiple correlates of alertness and within one experimental paradigm over the course of day.
Originele taal-2English
Pagina's (van-tot)589-601
TijdschriftJournal of Biological Rhythms
Nummer van het tijdschrift6
Vroegere onlinedatum7-sep-2018
StatusPublished - dec-2018

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