Reference no: EM133979966

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a. Trichromatic color vision is based on the presence of three types of cone cells in the retina, each with a different spectral sensitivity. These cones are sensitive to short, medium, and long wavelengths of light (corresponding to blue, green, and red, respectively.) The combination of signals from these cones allows us to see a wide range of colors.

b. The millions of colors we see are produced by the brain's ability to process and interpret the signals from the three types of cone cells. The brain combines the signals from the cones and creates a representation of color based on the relative amounts of activation of each type of cone.

c. Opponent-process theory explains how we perceive color in terms of pairs of color-opponent channels, such as red-green, blue-yellow, and black-white. This theory proposes that there are neurons in the visual system that respond in an opposite manner to pairs of colors. For example, there are neurons that respond to red light and inhibit the response to green light, and vice versa. The opponent-process mechanism increases our ability to discriminate between colors and helps to explain color afterimages.

d. I think humans evolved trichromatic color vision and not mono-, di-, or tetrachromatic color vision because of environmental factors brought on by evolution. In essence it was a survival tactic! In order for humans to visually decode the world around them, their vision had to adjust.

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