Important physiological processes in the brain and body on and off with the presence or absence of natural or artificial light. Biochemical processes triggered by light include the production of vitamin D, inhibition of melatonin (a hormone that affects mood), and stimulation of serotonin and noradrenaline (brain chemicals that affect mental alertness and well-being).
Light-sensitive cells in the eye called photoreceptors convert sunlight into electrochemical impulses that are transmitted through the optic nerve to the brain that affect vision centers and activate the endocrine system. Many of the functions necessary for growth and well â € “breathe, sleep, blood pressure, body temperature, appetite, mood, mental acuity, and the immune system â €” are governed by the endocrine system and, therefore, is affected by natural light.
There is also evidence that a good amount of light perceived visually are necessary for the healthy functioning of the cerebral cortex, the part of the brain that controls motivation, learning and creativity, the limbic system, part of the brain that stores emotional views the world, and the motor cortex of the brain and stem parts of the brain that coordinate body movement and the maintenance of life.
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