Search results
Results from the WOW.Com Content Network
Indoor lighting can have a variety of effects on human subjects living or working within an artificial indoor environment. A study with ninety-six subjects, ages ranging from 18 to 55, were examined on how a variety of lighting could impact their mood and cognition.
Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. [9] The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. [9] Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. [12]
A study completed in 2009 revealed that as little as twenty minutes of light exposure can improve the mood of those with SAD. [7] Additionally, it has been found that bright light (at a minimum of 2500 lux "at eye level") [ 8 ] has a higher rate of effectiveness than dimmer light levels in protecting against the "mood lowering" symptom that is ...
Diurnal mood improvement was associated with activity of dorsal neural networks. Increased mean core temperature was also observed. One hypothesis proposed that depression was a result of a phase shift. [30] Daytime light exposure correlates with decreased serotonin transporter activity, which may underlie the seasonality of some depression. [31]
Blue light causes people to feel relaxed, which has led countries to install blue street lights in order to decrease suicide rates. [24] A railroad company in Japan installed blue lighting at its stations in October 2009 in an effort to reduce the number of rail suicide attempts, [25] although the effect of this technique has been questioned. [26]
A mood disorder can be classified as substance-induced if its etiology can be traced to the direct physiologic effects of a psychoactive drug or other chemical substance, or if the development of the mood disorder occurred contemporaneously with substance intoxication or withdrawal.
Seasonal affective disorder (SAD) is a mood disorder subset in which people who typically have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year. [ 1 ] [ 2 ] It is commonly, but not always, associated with the reductions or increases in total daily sunlight hours that occur during the winter ...