Higher light intensity induces modulations in brain activity even during regular daytime working hours

Smolders, Kchj Karin; Kort, de Yaw Yvonne; Cluitmans, Pjm Pierre

doi:10.1177/1477153515576399

Cited by 24 publications

(15 citation statements)

References 60 publications

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“…Moreover, studies also revealed changes in brainrelated indicators of arousal and alertness under bright versus dim light exposure, for example increases in hemodynamic activity in the Locus Coeruleus [6] and changes in electroencephalographic (EEG ) theta and alpha power density [23][24][25]. In these studies, physiological arousal levels were either measured during cognitive task performance [6,17,21,22] or in rest (sitting or lying down) with eyes open or closed [19,20,[23][24][25].…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

Huiberts

Smolders

Kort

2016

Physiology & Behavior

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This study investigated diurnal non-image forming (NIF) effects of illuminance level on physiological arousal in parallel to NIF effects on vigilance and working memory performance. We employed a counterbalanced within-subjects design in which thirty-nine participants (mean age = 21.2; SD = 2.1; 11 male) completed three 90-minute sessions (165 vs. 600 lux vs. 1700 lux at eye level) either in the morning (N=18) or afternoon (N=21).During each session, participants completed four measurement blocks (incl. one baseline block) each consisting of a 10-minute Psychomotor Vigilance Task (PVT) and a Backwards Digit-Span Task (BDST) including easy trials (4-6 digits) and difficult trials (7-8 digits).Heart rate (HR), skin conductance level (SCL) and systolic blood pressure (SBP) were measured continuously.The results revealed a significant improvement on the BDST difficult trials under 1700 lux vs. 165 lux (p = 0.01), while illuminance level did not affect performance on the PVT and BDST easy trials. Illuminance level impacted HR and SCL, but not SBP. In the afternoon sessions, HR was significantly higher under 1700 lux vs. 165 lux during PVT performance (p = 0.05), while during BDST performance, HR was only slightly higher under 600 vs. 165 lux (p = 0.06). SCL was significantly higher under 1700 lux vs. 165 lux during performance on BDST easy trials (p = 0.02) and showed similar, but nonsignificant trends during the PVT and BDST difficult trials. Although both physiology and performance were affected by illuminance level, no consistent pattern emerged with respect to parallel changes in physiology and performance. Rather, physiology and performance seem to be affected independently, via unique pathways.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

Huiberts

Smolders

Kort

2016

Physiology & Behavior

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“…et al [9] and Smolders, K.C. et al [10]), as well as the visual perception of interiors (Yao, J. et al [11] and Fabi, V. et al [12]). Gou, Z. et al studied the visual comfort and light simulated effects in relation to workers' productivity and well-being [13,14].…”

Section: Introductionmentioning

confidence: 99%

Daytime Lighting Assessment in Textile Factories Using Connected Windows in Slovakia: A Case Study

2018

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This paper highlights the problems that are associated with daylight use in industrial facilities. In a case study of a multi-story textile factory, we report how to evaluate daylight (as part of integral light) in the production halls marked F and G. This study follows the article in the Buildings journal, where Hall E was evaluated (unilateral daylight). These two additional halls have large areas that are 54 × 54 m and are more than five meters high. The daylight is only on the side through the attached windows in envelope structures in the vertical position on the hall. In this paper, we want to present two case studies of these two production halls in a textile factory in the eastern part of Slovakia. These are halls that are illuminated by daylight from two sides through exterior peripheral walls that are against or next to each other. The results of the case studies can be applied in similar production halls illuminated by a "double-sided" (bilateral) daylight system. This means that they are illuminated by natural illumination through windows on two sides in a vertical position. Such a situation is typical for multi-storied industrial buildings. The proposed approximate calculation method for the daylight factor can be used to predict the daylight in similar spaces in other similar buildings.

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“…Smolder et al indicated that bright light (1000 lx at eye level) modulated brain activity and enhanced alertness during the afternoon [56]. Also, Min et al reported that bright light (700 lx at eye level) decreased alpha activity and increased alertness during the daytime.…”

Section: Discussionmentioning

confidence: 99%

Non-Image Forming Effects of Light on Brainwaves, Autonomic Nervous Activity, Fatigue, and Performance

Askaripoor¹,

Motamedzade²,

Golmohammadi³

et al. 2018

Journal of Circadian Rhythms

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Fatigue and sleepiness are one of the main causes of human errors and accidents in the workplace. The empirical evidence has approved that, in addition to stimulating the visual system, light elicits brain responses, which affect physiological and neurobehavioral human functions, known as the non-image forming (NIF) effects of light. As recent evidences have shown the positive effects of red or low correlated color temperature white light on alertness and performance, we investigated whether exposure to 2564 K light could improve subjective and objective measures of alertness and performance compared with 7343 K, 3730 K, and dim light (DL) conditions during the daytime. Twenty two healthy participants were exposed to the light while they were performing a sustained attention task and their electroencephalogram (EEG) and electrocardiogram (ECG) were recorded. Both 2564 K and 7343 K conditions significantly reduced EEG alpha-power compared with the DL and 3730 K conditions. Moreover, the 2564 K, 7343 K, and 3730 K conditions significantly reduced subjective fatigue, sleepiness and increased heart rate and performance compared with the DL condition. Furthermore, the effects of light conditions on alertness and performance varied over the day so that more effective responses were observed during the afternoon hours. These findings suggest that light interventions can be applied to improve daytime performance.

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Higher light intensity induces modulations in brain activity even during regular daytime working hours

Cited by 24 publications

References 60 publications

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

Non-image forming effects of illuminance level: Exploring parallel effects on physiological arousal and task performance

Daytime Lighting Assessment in Textile Factories Using Connected Windows in Slovakia: A Case Study

Non-Image Forming Effects of Light on Brainwaves, Autonomic Nervous Activity, Fatigue, and Performance

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