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Is it frequency-modualated or are different colors transmitted by different axons?

I know that each ganglion cell is connected to multiple photoreceptors. How does it tell the brain which photoreceptors are exactly activated and in what color?

Do ganglion cells correspond to particular colors?

Can one ganglion cell transmit different signals to the brain?

How the brain knows which color is light if signals of different receptors are mixed in the ganglion?

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I believe that some preprocessing takes place in the retinal ganglion cells (see also en.wikipedia.org/wiki/Color_vision#Color_in_the_human_brain), so the brain does (probably) not have any information on which types of cones that are activated. I dont know how the colour information is transmitted from ganglion cells to brain though. –  fileunderwater Dec 18 '13 at 15:24
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possible duplicate of What gives things their colour? –  The Last Word Jun 6 at 7:16
    
@The Last Word no, that answer deals with the eye. –  Anixx Jun 6 at 9:22
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