Genetics

Study suggests neuronal origin of 'they all look alike'

A team of researchers from the University of California and Stanford University has found that the tendency to see people from different racial groups as interchangeable has a neuronal basis. In their paper published in Proceedings ...

Oncology & Cancer

Cancer-sniffing dogs 97% accurate in identifying lung cancer: study

Three beagles successfully showed they are capable of identifying lung cancer by scent, a first step in identifying specific biomarkers for the disease. Researchers say the dogs' abilities may lead to development of effective, ...

Psychology & Psychiatry

How color can help you de-stress

(HealthDay)—Many studies have shown that color affects both mood and behavior. Color can help you go from sad to happy or angry to calm.

Psychology & Psychiatry

Even psychological placebos have an effect

Placebo effects do not only occur in medical treatment—placebos can also work when psychological effects are attributed to them. Psychologists from the University of Basel reported these findings in the journal Scientific ...

Health

Could you be short on vitamin D?

(HealthDay)—You'd think vitamin deficiencies would be rare in the United States, but many people are running low on vitamin D, and it's a serious health threat.

Health

Host a healthy Thanksgiving feast

(HealthDay)—There are a number of ways you can serve up a healthier Thanksgiving meal, a nutrition expert says.

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Color

Color or colour (see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, green, blue and others. Color derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Color categories and physical specifications of color are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra. By defining a color space, colors can be identified numerically by their coordinates.

Because perception of color stems from the varying spectral sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance.

The science of color is sometimes called chromatics, colorimetry, or simply color science. It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what we commonly refer to simply as light).

This text uses material from Wikipedia, licensed under CC BY-SA