Light effects on circadian rhythm | Wikipedia audio article
Channel: wikipedia tts
Date: 04/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Light_effects_on_circadian_rhythm


00:01:40 1 Mechanism
00:04:53 2 Effects
00:05:02 2.1 Primary
00:09:04 2.2 Secondary
00:12:44 3 Measured Lighting for Rating Systems
00:17:11 4 Other factors
00:18:26 5 See also



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SUMMARY
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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.  Therefore, they must, either continually or repeatedly, be reset to synchronize with nature's cycle.  In order to maintain synchronization ("entrainment") to 24 hours, external factors must play some role. The human circadian rhythm occurs typically in accordance with nature's cycle. The average activity rhythm cycle is 24.18 hours in adulthood but is shortened as age increases.  One of the various factors that influence this entrainment is light exposure to the eyes. When an organism is exposed to a specific wavelength of light stimulus at certain times throughout the day, the hormone melatonin is suppressed, or prevented from being secreted by the pineal gland.