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This discovery has generated interest and discussion among scientists because it raises important questions about the evolutionary pressures that led to the development of color vision. Early forms of color vision may have been utilized for activities such as foraging, mate choice, or avoiding predators, even in a less colorful world. [11]
While color vision is dependent on many factors, discussion of the evolution of color vision is typically simplified to two factors: the breadth of the visible spectrum (which wavelengths of light can be detected), and; the dimensionality of the color gamut (e.g. dichromacy vs. tetrachromacy).
Color vision is categorized foremost according to the dimensionality of the color gamut, which is defined by the number of primaries required to represent the color vision. This is generally equal to the number of photopsins expressed: a correlation that holds for vertebrates but not invertebrates .
For example, staring at a saturated primary-color field and then looking at a white object results in an opposing shift in hue, causing an afterimage of the complementary color. Exploration of the color space outside the range of "real colors" by this means is major corroborating evidence for the opponent-process theory of color vision.
An example of a connotative color task based on cultural meaning are traffic lights, which require not only recognizing the color, but interpreting the meaning of the color (red means stop). Examples of connotative color tasks based on natural meaning are interpretation of skin tone (blushing, sunburn, pallor, etc.) and interpretation of food ...
The colors in each pair oppose each other. Red-green receptors cannot send messages about both colors at the same time. This theory also explains negative afterimages; once a stimulus of a certain color is presented, the opponent color is perceived after the stimulus is removed because the anabolic and catabolic processes are reversed. For ...
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For example, red-white is said to be "red-green", or green-white is called "green-red". The second is when a pair of lights of the same color but differing in brightness by 50% is displayed, the brighter identical color is said to be "white". For example, green(dim)-green(bright) is called "green-white".