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Different parts of the retina respond to the frequency of photons hitting them at 400 - 800 nm - electromagnetic radiation.

You can't be me, I'm taken
by Sven Triloqvist on Thu Dec 27th, 2007 at 03:53:33 PM EST
[ Parent ]
That's what the pigments do.

But since there are wavelengths of light at which all pigments will react, albeit at different relative intensities, the way the visual system responds to frequency is quite convoluted and indirect.

We have met the enemy, and he is us — Pogo

by Migeru (migeru at eurotrib dot com) on Thu Dec 27th, 2007 at 03:56:40 PM EST
[ Parent ]
But the receptors respond in wide bands of frequency, and colour vision doesn't analyse frequency but tricolor readings, which is thus already discrete. (IOW Migeru was right but he was only nitpicking: what you say is valid for hearing.)

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Thu Dec 27th, 2007 at 03:57:07 PM EST
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