Impact of daytime spectral tuning on cognitive function

Lok, Renske; Joyce, Daniel S.; Zeitzer, Jamie M.

doi:10.1016/j.jphotobiol.2022.112439

Cited by 12 publications

(8 citation statements)

References 67 publications

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“…When deployed as room lighting, metameric daytime lights but with varying levels of melanopsin stimulation modulated the pupil light reflex in a dose-and illuminance-dependent manner, but modulated objective sleepiness at low (100 lux) illuminance only (de Zeeuw et al 2019). Indeed, while differences in cognitive functions were seen when participants were exposed to different ~4,000 K 100 lux room lighting technologies during the biological day, with different melanopsin excitations, such lighting was not sufficient to differentially protect against the effects of a 200 lux evening exposure of light on subjective or objective measures of alertness (Lok et al 2022). These studies underscore the important interactions between the human biological clock and light's spectral properties, intensities, and timings, and that different output pathways may have different sensitivities.…”

Section: Circadian Rhythms and Iprgcsmentioning

confidence: 98%

Melanopsin Vision

Joyce

Houser

Peirson

et al. 2022

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Intrinsically photosensitive retinal ganglion cells (ipRGGs) are the most recently discovered photoreceptor class in the human retina. This Element integrates new knowledge and perspectives from visual neuroscience, psychology, sleep science and architecture to discuss how melanopsin-mediated ipRGC functions can be measured and their circuits manipulated. It reveals contemporary and emerging lighting technologies as powerful tools to set mind, brain and behaviour.

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Section: Circadian Rhythms and Iprgcsmentioning

confidence: 98%

Melanopsin Vision

Joyce

Houser

Peirson

et al. 2022

Self Cite

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“…Longer exposure (~8 h) to blue-enriched light during the daytime also leads to improved working memory, procedural learning, and processing speed in sleep-restricted young adults [ 92 ]. Another study reported that long daytime exposure (~10 h) to high melanopic content, blue-enriched white LEDs led to an improvement in daytime cognitive function, which may not be due to changes in daytime alertness [ 93 ]. However, further research in humans is needed to understand how light can affect alertness and cognition during the day and how it impacts memory during its encoding, consolidation, and retrieval phases in humans [ 94 ].…”

Section: Light: Circadian and Acute Impactsmentioning

confidence: 99%

Light as a Modulator of Non-Image-Forming Brain Functions—Positive and Negative Impacts of Increasing Light Availability

2023

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Light use is rising steeply, mainly because of the advent of light-emitting diode (LED) devices. LEDs are frequently blue-enriched light sources and may have different impacts on the non-image forming (NIF) system, which is maximally sensitive to blue-wavelength light. Most importantly, the timing of LED device use is widespread, leading to novel light exposure patterns on the NIF system. The goal of this narrative review is to discuss the multiple aspects that we think should be accounted for when attempting to predict how this situation will affect the NIF impact of light on brain functions. We first cover both the image-forming and NIF pathways of the brain. We then detail our current understanding of the impact of light on human cognition, sleep, alertness, and mood. Finally, we discuss questions concerning the adoption of LED lighting and screens, which offer new opportunities to improve well-being, but also raise concerns about increasing light exposure, which may be detrimental to health, particularly in the evening.

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“…Photobiology, which is the study of the biological effect of light on living organisms, is recently gaining more importance in architectural and environmental research mostly because of its impact on wellbeing, addressing human biological rhythms and circadian health. 16,[21][22][23][24][25][26][27] Research shows that the human visual response to light is twofold, consisting of imageforming (IF) and non-image-forming (NIF) responses. 28,29 The IF response refers to vision in its traditional sense.…”

Section: Photobiology In Lighting Patternsmentioning

confidence: 99%

Representing the photobiological dimension of light in northern architecture

Lalande

Hébert

Potvin

et al. 2023

Indoor and Built Environment

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Daylight can enhance the quality and inhabitability of architecture through a better relationship with the exterior environment, especially by its intensity, chromaticity and ability to synchronize the human circadian clock. Daylight integration in architecture remains a challenge in Nunavik (Quebec, Canada) due to its subarctic climate, photoperiod and solar geometry. The objective of this research is to implement photobiological metrics of light in architectural representations by isolating the photopic (daytime vision) and melanopic (circadian clock) portions of the electromagnetic spectrum, and to spatialize daylight and artificial light in relation to landscapes and indoor architectural spaces. An automated and low-cost capture tool based on Raspberry Pi microcomputers and Camera Modules (RPiCM) captures high dynamic range images, which accurately measure luminance to render human perception. Absolute photopic luminance maps (cd/m2) are supplemented with false colour displays of photopic/melanopic contents of light regarding building surface materials. The research develops photometric captures of absolute photopic and melanopic illuminance (lux, EML). Photobiological metrics of light are integrated into a set of physical properties of lighting patterns to perform light assessments and are ultimately represented as a graphical display to help designers and researchers to evaluate architectural interior–exterior relationships through daylight qualities.

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Impact of daytime spectral tuning on cognitive function

Cited by 12 publications

References 67 publications

Melanopsin Vision

Melanopsin Vision

Light as a Modulator of Non-Image-Forming Brain Functions—Positive and Negative Impacts of Increasing Light Availability

Representing the photobiological dimension of light in northern architecture

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