Those who know pets may have heard that dogs are color blindness; cats are myopia. The movie "Cat and Dog" and "Loyal Dog Eight Gong" also tell us this situation, but is it really color blindness? Intersection Is their world really black and white and gray without any color at all? Xiaobian will reveal the problem of dog color blindness for you today.
In fact, dogs can also distinguish a little color, but there are more colors that we humans see
If the dog is a color blindness, this statement is somewhat uncertain. However, if "color blindness" here refers to compared with humans. Dogs can only see part of the visible light spectrum, then, yes, dogs are color blindness. Scientists can use two methods to determine this. However, let's first let us see what we look like in the eyes of dogs.
Dogs have two cone cells on the retina of the dog, which can identify the light wavelength of short wavelength and mid -length wavelength, that is, you can feel the blue light (the light wave with a short wavelength) and the red and yellow light (medium -length wavelength light wave). Because of the few cone cells, the color of the world in the dog's eyes is very monotonous, not as colorful as the world in the eyes of humans. However, human beings have three types of cone cells that allow us to see all colors in visible spectra. Because the dog has only two cone cells, the color that the dog can tell is the same as the red -green blind patients can be distinguished. However, patients with color blindness can also see many other different colors, so can dogs also see these colors? Scientists have adopted two methods to determine this.
What exactly does the dog's eyes see?
One method is to illuminate the dog's eyes with a colored light beam, so that a image reflected from the dog's eyes will be obtained. Scientists study the image of this reflected return; after that Image comparison.
Another way is to train dogs to "tell" the world they see. In the experiment, the scientists continuously showed the dogs in the dogs, each with three colors each, two of them were the same. In addition, for a small amount of training, the dog will use the nose to point to the scientists that the unique color of each group will be used. Scientists only need to constantly change the color of light and repeat this process, and they can draw such a conclusion: the world is black in the eyes of dogs. White and dark gray, at the same time, are mixed with red and yellow light and blue light with medium -length light waves. The world is like the picture in black and white TVs. Only the brightness of the black mortar is different, and the color changes cannot be distinguished. The reason why guide dogs can distinguish the red and green signal lights are different from the lightness of the two lights. The dog's distinguishing power of the gray light is very subtle. Relying on this ability, it can distinguish the light and dark changes on the object and produce a three -dimensional visual image.