Publication

EPFL Smart Glass Field Study

Marilyne Andersen, Forrest Simon Webler, Victoria Eugenia Soto Magán
2018
Conference Papers

Abstract

The objectives of this study are to evaluate (1) direct non-visual effects of red-impoverished daylight on circadian resetting and alertness and (2) the daily light-exposure pattern on indirect–circadian–effects. The novelty of this study is that it will be conducted on the EPFL campus in two identical classrooms outfitted with electrochromic windows from SageGlass. Studying non-visual effects under real-life conditions are essential to better understand the role of an adaptive glazing to improve alertness in the context of a classroom. We will also log irradiance and illuminance at eye level in order to document light received at the eye over two 6-day trials. We hope that recording light exposure during wake hours will help us to better understand the type of light people receive on a daily basis and if adaptive glazing technologies can help mitigate negative physiological responses normal working hours.

Official source

https://infoscience.epfl.ch/entities/publication/e7a25290-0d79-4df8-b2c7-8d52fe8ee863

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Marilyne Andersen, Forrest Simon Webler, Victoria Eugenia Soto Magán
2018
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e7a25290-0d79-4df8-b2c7-8d52fe8ee863

About this result

Related concepts (17)

Circadian rhythm

A circadian rhythm (sərˈkeɪdiən), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment). Circadian rhythms are regulated by a circadian clock whose primary function is to rhythmically co-ordinate biological processes so they occur at the correct time to maximise the fitness of an individual.

Non-24-hour sleep–wake disorder

Non-24-hour sleep–wake disorder (non-24 or N24SWD) is one of several chronic circadian rhythm sleep disorders (CRSDs). It is defined as a "chronic steady pattern comprising [...] daily delays in sleep onset and wake times in an individual living in a society". Symptoms result when the non-entrained (free-running) endogenous circadian rhythm drifts out of alignment with the light–dark cycle in nature. Although this sleep disorder is more common in blind people, affecting up to 70% of the totally blind, it can also affect sighted people.

Light effects on circadian rhythm

Light effects on circadian rhythm are the effects that light has on circadian rhythm. Most animals and other organisms have "built-in clocks" in their brains that regulate the timing of biological processes and daily behavior. These "clocks" are known as circadian rhythms. They allow maintenance of these processes and behaviors relative to the 24-hour day/night cycle in nature. Although these rhythms are maintained by the individual organisms, their length does vary somewhat individually.

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