Scientists try to find such four-color color vision, and it took more than 20 years to find a person with four-color color vision ability from many subjects (Of course from It ’s not the only one looking at the current publication) .
Of course there are factors that limit the experimental method, but there are also surveys showing that more than 15% of women may be four-color color visionists. Why can’t they find it?
This is probably because the ability of the newly-generated fourth type of cone cells is actually very close to the red and green cone cells. During the process of getting the signal into the brain, the information that is too close may not be recognized. Therefore, he failed to give full play to the advantages of the four colors.
The fourth cone of the four-color color visionist found by the scientist above, the perceived light differs from the perceived red light by 12nm.
Two women with four types of cone cells, the left one because the fourth type of cone cell is very close to the original three kinds of perceived light, so the brain cannot distinguish , So in fact, it does not have the ability to develop the four-color color vision. The right picture shows the cone cells that the real four-color color vision person has (source: Sofia Deleniv)
So even though millions of people may have four types of cones, there are actually few lucky four-color visions that can perceive hundreds of millions of colors.
As for the color of the four-color color visionrs wearing yellow glasses, you may need to imagine it yourself.
Evolution and color
But in fact, many animals in nature have four-color color vision, even five-color color vision, such as birds, reptiles, insects, etc. Then we can only see three colors!
Calm down