Quote:
Originally Posted by JMV
Quote:
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Originally Posted by Jeff Root
I'm sure you have a graph of human color sensitivity
at hand. Preferably one that doesn't normalize the peaks. You can
see that even the red and blue have a great deal of overlap. Only
the relative rate of stimulations in the different cones enables the
signal procesing mechanisms in the eyes to distinguish different
colors, when a sufficiently large number of stimulations occur.
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It's not about two types of cones having overlap. The question is
whether "blue" cones have any response to light at, let's say,
650 nanometers wavelength. I don't have a non-normalized graph
available, but many normalized graphs I've seen don't show S (blue)
cones having any relative sensitivity for light at red wavelengths;
the S cone sensitivity seems to fall off at 550 nanometers. But
then again, those graphs are pretty inexact and normalized so I
can't say either way. Hope someone has better info on this. |
You are right. I was replying to my interpretation of what George
said, rather than to what George said. While there is a great deal
of overlap in spectral sensitivity of the blue and red receptors, that
overlap does not extend, for blue receptors, all the way to red light
wavelengths.
However, if the laser Kaptain K introduced to the thread is somehow
able to stimulate a blue receptor using red light, then the person will
see blue, as long as other receptors nearby are not stimulated.
-- Jeff in Minneapolis
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