2006-09-20 00:30:11 · 8 answers · asked by Anonymous in Social Science ➔ Other - Social Science
Isn't it a spread of coloured dots across the tv screen?
2006-09-20 00:33:10 · answer #1 · answered by Anonymous · 1⤊ 3⤋
There are two types of cells in the retina that are involved in photoreception, rods and cones. Cones are the ones that are involved in colour detection. There are three types of cone cells, which respond maximally to red, blue and green light respectively. Different colours are perceived according to the 'relative contributions of blue, green, and red cones to the retinal signal.' The brain 'decides' which colour it's perceiving according to the differing inputs from the three types. If all three types are equally active, the brain will perceive the colour white.
This theory of colour vision and colour perception is known as the Young-Helmholtz trichromacy theory.
2006-09-20 07:41:46 · answer #2 · answered by lauriekins 5 · 0⤊ 0⤋
Color vision is the capacity of an organism or machine to distinguish objects based on the wavelength (or frequency) of the light they reflect or emit. In animals, the nervous system derives color by comparing the responses to light from the several types of cone photoreceptors in the eye. These cone photoreceptors are sensitive to different portions of the visible spectrum. For humans, the visible spectrum ranges approximately from 380 to 750 nm, and there are normally three types of cones. The visible range and number of cone types differ between species.
2006-09-20 07:43:57 · answer #3 · answered by Blah 7 · 2⤊ 0⤋
Different colours emmit light at different frequencies.
Light sensitive nerves in your eye respond to the different lights, interpreted by your brain as colour.
2006-09-20 07:41:13 · answer #4 · answered by badgerbeetle 3 · 0⤊ 0⤋
Cone cells located on our retinas recept photons, or light particles and are responsible for acute vision as well as seeing color. The concentration of these cells in the center of our retinas is what allows us to differentiate color.
2006-09-20 07:42:17 · answer #5 · answered by Elkie 2 · 0⤊ 0⤋
there are two type of light-receptive cells at the back of your eyes. 'Rod' cells pick up light intensity, sending a strong nerve pulse to the brain in relation to how bright the light is that's coming into the eye. This determines light and shade. 'Cone, cells pick up light spectrum, a different pulse frequency is sent to the brain in response to different colored light. Different colors produce different responses and the brain translates this information back into a color and/or shade.
2006-09-20 07:41:33 · answer #6 · answered by tony_copeland 3 · 0⤊ 0⤋
rods and cones receptors at the back of the eye.........send signals to brain for decoding into colour.
2006-09-20 07:37:58 · answer #7 · answered by Wobs 3 · 0⤊ 0⤋
something to do with the way the eyes work!hehehe
2006-09-20 13:03:11 · answer #8 · answered by sholii 2 · 0⤊ 1⤋