Talk:Cone cell
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A bit on colour blindness would be interesting. Would it belong here? --Cuervo 11:34, 18 Apr 2005 (UTC)
Re the comment above, there's a really interesting site at http://www.iamcal.com/toys/colors/index.php (thsi is nothing to do with me) that allows you to select text color and background color and then replicate what folks woudl see if suffering with different forms of color blindness -- I was VERY impressed.
Also, I recently spent a lot of time writing a paper on color vision -- this includes info on cone cells and on the evolution of vision systems.You can find it on my site at www.diycalculator.com/sp-cvision.shtml. I think it provides a very useful background piece that's worth an external link. But I'll leave that up to whoever is in charge. Cheers -- Max (max@diycalculator.com).
and there have been reports of people with four or more types of cone cells This could be the case if the subject is female, since the genes lie on the X chromosome, making it possible, in theory, to have two different kinds of L and M cones, all differing slightly in sensitivity maximum. I do not know if any test exist to test people for this condition, nor is it clear if subjects would benefit and if so to what extent. 88.211.131.57 22:25, 8 February 2007 (UTC) (koenb)
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[edit] Animals
The article deals chiefly with human cones - would it be reasonable to mention a few things about animal cones? The loss of a cone in the majority of mammals for example, the reclaiming of a third cone by primates through evolution, the fact that many birds in fact possess 4 types of cone, with one having the ability to detect ultraviolet light and giving them a much more complex colour tetrahedron (rather than the triangle of colour available to humans)?
- Agreed. Too bad I know nothing about it. I'd like to see those things added. Twilight Realm 18:49, 9 May 2007 (UTC)
- I just read all about it in The Making of the Fittest. Great story. But long for summarizing here. Dicklyon 05:10, 25 May 2007 (UTC)
[edit] Violet
Why does "spectral violet" (light with shorter wavelength than blue, as opposed to light with both blue and red wavelengths) appear different than regular blue? There aren't any additional cones to detect sub-blue light. Is it because of the slight increase in sensitivity for red cones for wavelengths shorter than 450 nm? Twilight Realm 18:47, 9 May 2007 (UTC)
When we are seeing 440nm spectral blue, it activates the S cones fully, and also a little bit of of M cones. Our brain is used to treat this as "blue", and it is indeed the color that activates S cones the most. When we see spectral violet, only the S cones are activated, not the M or L ones. That's the difference which makes us see a different color, treated by our brain as "violet", even though it only activates S cones. Ratfox 00:07, 1 November 2007 (UTC)
[edit] Human cone response
Please provide the complete un-normalized response curves of the three types of humans color receptors, and show how this adds up to (or differs from) the Luminosity function.-69.87.203.133 02:22, 25 May 2007 (UTC)
- see Talk:Luminosity function#Human cone response – Dicklyon 05:06, 25 May 2007 (UTC)
[edit] Rods vs Cones?
If there are more rods than cones in the human retina, then rods provide finer details, not cones (as the introduction says). Similarly for the speed, I was taught that rods are faster, again in contrast to the introduction. Pavel —Preceding unsigned comment added by 147.33.113.54 (talk) 14:57, 6 December 2007 (UTC)
- The fovea is all cones, and that's where you get detail. Cones are fast at high enough light levels; at low light levels where only rods operate, they operate slowly. I'm not sure if what the lead says is really right, though; can you find some sources to check it? Dicklyon (talk) 15:54, 6 December 2007 (UTC)
