8
votes
Accepted
How credible is the Remenko's two-component color vision theory?
That era produced a lot of very questionable science from Russia; there is no good reason to doubt the three-component color vision theory, and it's also the basis of all RGB TVs and computer monitors....
- 41.2k
6
votes
Accepted
Do color-blind people have more rod cells in their retinae than the normally sighted?
Short answer
There are not many studies that have counted rods and cones in the human retina, let alone compared healthy retinas with those of color blind people. Yet direct evidence, as well as ...
- 52.2k
5
votes
Accepted
What color does the other cone in Tetrachromacy correspond to?
According to Deeb (2005), there are two relatively common types of causes for tetrachromacy in humans:
The common Ser180Ala polymorphism, which results in two spectrally different red pigments in the ...
- 52.2k
5
votes
Accepted
Melatonin production, sleep, and "cyan light"; how might this finding be possible?
Melatonin production is in response to photoreceptors in the eye, in part, the same photoreceptors in rods and cones that process and transmit information about the wavelength of light (eventually) to ...
- 8,741
5
votes
For humans, why is red the color of distinction rather than green?
The reason is more historical than biological.
Our own eyes are more sensitive to green light, and ambient light is mostly green (we are a diurnal being). If you start doing real botany, you will ...
4
votes
Accepted
Are color-blind carriers partially colorblind?
Looking at the literature, I find the following passage in a review of the genetics of colorblindness:
Females have two X-chromosomes, and can either be homozygous or heterozygous for the X-...
- 8,728
2
votes
Accepted
Why are some plants naturally yellow?
There simply can't be one answer to this question, especially since I couldn't identify the plant from the photo. However, looking at the different possibilities can be helpful, even if it's just ...
- 219
2
votes
Accepted
What is "beto carotene" and how can it turn lakes pink?
The "beto" is a typing mistake. Beta is an organic chemistry label referring to a beta-ring of 6 carbons that exists at either end of a carotenoid polymer C40-Hx.
It is localized in the chloroplast. ...
- 9,287
2
votes
Multiple numbers in the Ishihara test?
The Ishihara Color Test consists of plates containing one number. But that number may consist of two digits (Fig. 1). After scouring the internet I have also found variants of the test where the each ...
- 52.2k
2
votes
Do Colorblind People Have Stronger Sensitivity in Their Other Remaining Cones?
Kudos for Delta-S in Reddit for enlighten me. Original post is here.
The answer is no, color blind people don't have stronger sensitivity in their other remaining cones. This goes back to the ...
- 387
2
votes
Melatonin production, sleep, and "cyan light"; how might this finding be possible?
I am guessing that this even possible because color perception comes through the sensitivity of three (or four?) color channels and so two different spectra can appear to be the same color.
While ...
- 9,094
2
votes
Accepted
How do you check how many cones you have in your eye?
One of the two confirmed cases of tetrachromacy was confirmed genetically:
From this Popular Science article:
Based on Antico's genes, Jameson has determined that Antico's fourth
cone absorbs ...
- 2,723
2
votes
Accepted
How does a "chromogenic mixture" produce such pronounced color differences in this Agar Art?
She is referring to a mixture of chromogenic substrates: molecules which are more or less colourless until cleaved by a specific enzyme, releasing a coloured product.
For example X-gal is colourless ...
- 17.6k
1
vote
Accepted
Why do colors clash in your brain?
Magnify your image.
I just put it in GIMP and it is clear that there are several pixels in the red and the blue near the border which are a darker color than those adjacent - the drawing program must ...
- 2,439
1
vote
How can animals that rely on SONAR not see color?
Color is a characteristic of visible electromagnetic spectrum, see the graph here. Electromagnetic means here that it has the same nature as radio-waves, X-rays, and gamma radiation, whereas visible ...
- 3,812
1
vote
Is there any record of an Albino (Not leucistic) peacock
There is a breed of White Peacock. I could not find any record of 'Albino' Peafowls (the gender neutral term for peacock is peafowl (females are peahens). This white variety of peafowl is similar to ...
- 925
1
vote
What is "beto carotene" and how can it turn lakes pink?
There are several combined reasons.
first salt itself in such lakes is often pink, so part of the color comes from the salt crust itself. this is more noticeable in more extreme salt lakes where the ...
- 13.9k
1
vote
Trying to understand reduction of color dimension in colorblind case
Let's start with a quick overview of the different types of dichromats in man:
Protanopes have no functional red cones. Red appears as black. Certain shades of orange, yellow, and green all appear as ...
- 52.2k
1
vote
Deuteranopia confusion lines
Is this plane indeed random?
Answer : I don't think so.
HUMAN CONE RESPONSE
Let's take a look back at human cone response curve.
This is cone response curve for normal people :
But picture ...
- 387
1
vote
Is it possible to discriminate tetrachromacy using sRGB color?
All the combinations of three sRGB primary colors are distinct for a trichromat. This immediately precludes any way to find out whether you are capable of more: if even a trichromat can distinguish ...
- 395
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