Distinguish whether dogs color? The world through the eyes of the Ball

Remember the old phrase, "the Dog - man's best friend!" Yes, this assertion is difficult to argue. After all, four-legged Pets – the most loyal, reliable and affectionate. And they are unusually intelligent and capable. What do you think, do dogs distinguish colors? Until recently it was believed that they see the world only in black and white and no shades of the spectrum don't discriminate. But then it turns out that the rainbow after the rain, for example, they perceive white and black stripes, and other colors do not see at all, or look blurry. The fallacy of such a theory refuted by modern scientists. It has been proven that, unlike the human, the dog's eyes not able to see the whole range, but a few basic colors still available for their perception.

The world through the eyes of the Balloon

As you know, the eye distinguishes colors using nerve cells. In the retina there are two main rod defining the light level and dynamics, as well as cones are responsible for color detection. Human eyes contain three types of cones. They are able to distinguish between combinations of blue, red and green. Dogs have only two cones. Therefore, they have dichromatic vision. And on the question of whether dogs distinguish colors, it's safe to answer: their eyes can perceive only yellow and blue. But our friends can see in the dark and clearly define the movement of objects. This ability give the cage-rods. And dogs much more than people.

Color blindness: what is it

To understand, distinguish whether the dog color, it is worth mentioning the phenomenon of color blindness. This is a special term to determine the ability to distinguish colors. Its level due to the number of receptors able to perceive color. There are two main types of human color blindness: red-green and blue-yellow. To distinguish between these colors a colorblind person can not. So, if you put him in front of two vases - one red and another green, he will not be able to see the difference between them. They both will look gray. And what colors dogs can see? It turns out, their color vision is like red-green color blindness in humans.

What is the difference?

If the ability of animals to perceive colours of the spectrum limited the number of colors, it does not mean that dogs can not distinguish colors. They just can't see the color as it is in humans. Thus, red objects will appear dark gray or even black. Green and orange will be pale yellow. With blue color is a little easier: a dog's eyes, you see it is almost the same as we perceive it. But all the shades for them are just indistinguishable. For example, purple will be perceived, too blue. An Interesting experiment the researchers conducted with several species. To determine whether dogs distinguish colors, the subject was suggested by balls of two colors: red and yellow. They were given in turn. Initially offered are red, and a little later some of them quietly replaced the yellow. None of the dogs did not see the color difference. But thanks to the excellent sense of smell they were able to determine which of the balls came later. That is the main factor here was not the vision, and scent.

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By the Way, the perception-not the only difference between the dog's eyes from the human. Dogs see well in the twilight. But not all cases, their vision is acute. Sometimes dogs can be called myopic. For example, if the person and dog are close and look at one and the same object located at a certain distance, the animal image may seem blurry, and the man clearer. For example, the dog cannot see the object, located under her nose, but she finds his scent. Animals also did not respond to the brightness change colour – their eyes are not as sensitive as ours. Unfortunately, the world for them is not as bright as for you.

Features view dogs

But not all that bad. In some ways the dog's eyes are superior to ours. Yes, not all colors are perceived, and the vision they have not such sharp, but these disadvantages kompensiruet the fact that their eyes are located on either side of the head. This makes the angle of peripheral vision is much wider, thus balancing the lack of visual acuity.

The Cage-the bars in the dog, provide an opportunity to absorb the maximum amount of light. A reflective cells under the retina that make them shiny and allow you to see at dusk and at dawn. It seems that their eyes glow in the dark. But they simply reflect the incident light as spotlights. And another advantage: a dog's eye is in the retina a greater number of cells, which are responsible for the identification of movement of objects in space, even over long distances. That's why they often bark, lifting her head up. It seems to us, often for no reason. They are attracted by birds flying at high altitude, and we simply can not see.

Why the dog is vision?

Nature has taken care of that the dog could not only feed themselves and their offspring, but not to fall prey to predators. The ability to see in the dusk to distinguish the slightest movement at a great distance initially helped to survive in the wild. Nowadays many of them have warm shelter and enoughthe food is not necessary to extract – enough to go to the bowl. But the unique visual opportunities remain the same. This should account for the dog owners. Even when choosing a toy, you can be sure that, for example, the ball is yellow or blue dog will like it more than red or green. So now by understanding the principle of this perception, it is much easier to guess the animal's needs and to make the lives of pet more enjoyable.