| Trichromat |
Articles about Trichromat |
Information AboutTrichromat |
|
The normal explanation of trichromacy is that the organism's Retina contains three types of Color Receptors (called Cone Cell s in vertebrates) with different Absorption Spectra . In practice the number of such receptor types may be greater than three, since different types may be active at different light intensities. In vertebrates with three types of cone cells, at low light intensities the Rod Cell s may contribute to colour vision, giving a small region of Tetrachromacy in the colour space. Human s and other Old World Primate s are usually trichromats, as are female New World Monkey s of most species, and both male and female Howler Monkey s. Recent research suggests that trichromacy may also be quite general among Marsupial s. Most other mammals are currently thought to be Dichromat s, with only two types of cone (though the possibility of limited trichromacy at low light levels where the rods and cones are both active). Some species of Insects (such as Honeybee s) are also trichromats, being sensitive to Ultraviolet , blue and green instead of blue, green and red. SEE ALSO REFERENCES
EXTERNAL LINKS
|