One kind of people is color cognition.
One is light and dark cognition.
One is the mixed cognition of color and light and shade.
Why are the red and green dots together at the same time, and it is difficult for some people to distinguish the pattern composed of red and green?
Because in the eyes of this group of people, red is highly active and green is also highly active. When red and green are mixed together, they will turn to light and dark perspectives. This is a cognitive habit problem of the brain, not a color discrimination problem of color vision.