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Humans have three types of cones that respond to different wavelengths of light, allowing them to perceive up to a few hundred hues. Color vision is a feature of visual perception that is mediated by a complex process between neurons and photopsins, which are biological molecules that detect light.
Learn about the study of colors and hues as a determinant of human behavior, emotions and perceptions. Explore the history, principles and effects of color psychology, from ancient times to modern applications in marketing, art and therapy.
Divine light is an aspect of divine presence or revelation perceived or represented as light in various traditions and cultures. Learn about the types, terms, and meanings of divine light in Christianity, Buddhism, Hinduism, and more.
Rhodopsin, also known as visual purple, is a light-sensitive receptor protein that triggers phototransduction in rods. It is a G-protein-coupled receptor that binds retinal and absorbs green-blue light, causing it to appear reddish-purple.
Tetrachromacy is the condition of having four types of cone cells in the eye, which enables more color discrimination than trichromacy. Learn about the physiology, evolution, and human cases of tetrachromacy, as well as the difference between functional and non-functional tetrachromats.
The visible spectrum is the band of electromagnetic radiation that is visible to the human eye. Learn about the wavelengths, frequencies, photon energies, and colors of visible light, as well as the history of its discovery and study.
The post If You See a Purple Porch Light, This Is What It Means appeared first on Reader's Digest. People use colored lights to bring awareness to a variety of different issues. Here's the meaning ...
Learn about the factors that determine eye color in humans and other animals, such as melanin, light scattering and gene mutations. Find out how eye color has changed over time and across populations, and what percentages of people have different eye colors.