The dog s vision world is black and white, so how can it guide the blind to distinguish traffic ligh

I'm sorry to take the liberty of saying that dogs are colorblind has been disproved in '08, and the latest science proves that dogs can distinguish colors. Dogs are not completely colorblind, but they are considered amblyopia, and the difference between colors is blurry for them.

Most dogs rely on smell and hearing to distinguish people or objects, as for how many colors they can distinguish, they still have a sense of color, but that is not the important key for them to distinguish objects, they are still used to and good at using their noses to distinguish objects.

It is a mistake to think that dogs only have black and white in their eyes. But if by color blindness, you mean that dogs can only see parts of the visible spectrum compared to human vision, then you're right, dogs do have color blindness. Scientists also have some ways to confirm this idea.

But it's important to first understand how dogs see.

There are two colored photoreceptors, or cone cells, on a dog's retina that distinguish between short and medium-long wavelengths of light, namely blue (short wavelength) and reddish-yellow (long wavelength) hues. Humans have three types of cone cells that allow us to see all the colors in the visible spectrum. Because dogs have only two types of cone cells, they can distinguish colors like humans with red-green color blindness.

Of course, humans with color blindness can still see many different colors, so scientists believe that dogs can see so many colors as well.

How do scientists know? One way to do this is to put a colored light source into the puppy's eye, analyze the spectrum or pattern of the reflected light, and then compare the results with the results of the analysis of the same light source in the human eye.

Another way to study a canine's vision is to ask the puppies to tell scientists what they see. In the experiment, the scientists showed the puppy a series of three-color light sources; Two of the three light sources are the same color each time. With minimal training, dogs will be able to pick out colored light that is different from the other two with their noses.

By changing the color of the light source and repeating the experiment, the scientists determined that the world in dogs' eyes is black, white, and grayscale, as well as long-wavelength (red-yellow) and short-wavelength (blue) colors.

The dog is completely color blind, and its world is gray, but the dog's ability to distinguish the shade of gray is very subtle, and relying on this ability, it can distinguish the light and dark changes on the object, and produce a three-dimensional visual image. Guide dogs rely on the difference in the brightness of the two lights to produce conditioned reflexes to decide whether to go or stop. In this sense, traffic lights can be "recognized".

Dogs, also known as "dogs", have a scientific name called "domestic dogs". Together with horses, cows, sheep, pigs, and chickens, they are called "six animals".

Some scientists believe that dogs were domesticated from gray wolves by early humans, and that they were domesticated 40,000 years ago and developed to this day. Known as "man's most loyal friend", it is now the most popular pet. Its lifespan is about more than ten years.

In Chinese culture, the dog belongs to one of the 12 zodiac signs and is ranked 11th among the 12 zodiac signs.

Hmmm....I think it has something to do with the distribution of traffic lights, the red lights are usually on the far left or top, and the far right is the green light, or the bottom. Let's use this phenomenon to train dogs.

The pavement lights have a humanoid pattern, a walking person at a green light, a standing person at a red light, and a dog recognizes the pattern, not the color.

When you train, you may be divided into lights.

Dogs are distinguished by brightness, not color, of course.

Dogs distinguish traffic lights: The dog is completely color blind, its world is gray, but the dog's ability to distinguish the shade of gray is very subtle, relying on this ability to clear the cavity, you can distinguish the light and dark changes on the object, and produce a three-dimensional visual image. Guide dogs rely on the difference in the brightness of the two lights to produce conditioned reflexes, and the shed beam must go or stop.

In this sense, the dog can "recognize" the traffic light.

So it is a conditioned reflex, which can be formed through training, it is acquired, and it is not congenital, and the guide dog is a dog that has been rigorously trained, and it is a kind of working dog. Guide dogs are trained to help blind people get to schools, shops, laundries, street gardens, etc. They are accustomed to the restraint of collars, guide straps and other twinkle accessories, know many commands, can lead the blind to walk safely, and will guide their owners to stop when they encounter obstacles and need to turn to avoid danger.

Dogs are colorblind compared to humans, but dogs can see blue, yellow, and gray, so the misconception that dogs' world is black and white is wrong is wrong. Compared with humans, dogs are colorblind, but it does not mean that dogs cannot see color, and unlike the rumors on the Internet that dogs can only see black and white. At present, through the experimental verification of scientists, dogs can see blue, yellow and gray.

In 1995, the American Veterinary Medical Association confirmed through experiments that the dog's retina has many kinds of cone cells (an important feature of the cell's function is that it has the ability to distinguish colors), so the statement that everyone once mistakenly thought that the dog's world is black and white is wrong.

Compared to humans, dogs can really only see a part of the light, they can't distinguish the different colors of each state, and from this point of view, it is not wrong to say that they are colorblind. The structure of a dog's retina is different from that of humans, and there are only two types of cones in their retina, so they can feel very little light waves, and the colors they can perceive in the eyes of the nucleus dogs are very monotonous.

Then some people may have another question, how do guide dogs distinguish traffic lights and lead blind people to cross the road? In fact, this is because there is a difference in the brightness caused by the two beams of red light and green light. For the shade of gray, after a certain amount of training, the guide dog can be very sensitive to observe the change in brightness.

Through the comparison chart, it can be seen that dogs can clearly see blue, but the purple recognition color in their eyes is also blue, the red recognition color in their eyes is dark gray and black, and the blue-green recognition is gray, orange, yellow, and green are the dog's blind spots, and it is difficult for dogs to distinguish because they all look the same.

In addition, dogs also have a large number of rod-shaped cells in the omentum, and these cells can distinguish gray as long as there is a weak light, so researchers believe that dogs can distinguish gray that humans can't distinguish, which is why dogs' night vision is better than humans.

Summary: The main colors that dogs can see are yellow, blue, and gray.

Dogs are not colorblind, but color-weak, and are less sensitive to brightness and hue than humans; The main colors that dogs can see are yellow, blue, and gray; The colors that dogs don't easily distinguish are red, green, and orange. Dogs are not colorblind, but color-weak, and are less sensitive to brightness and hue than humans; The main colors they can see are yellow, blue, and gray. The colors that dogs don't easily distinguish are red, green, and orange.

So the lawn is yellow or light blue to the dog's eyes, and the red flowers are brownish-black to the dog's eyes.

In 1995, the Journal of the American Veterinary Medical Association published a document showing that dogs' retinas also have rod cells and cone cell voids, so dogs that have long been thought to only be able to see black and white can actually see color.

But because there are three types of cones in humans, we can see all the colors in the spectrum. Dogs only have two kinds of cones, which can only distinguish black, white, gray, blue, purple, etc., but red, green, etc.

The dog's retina has a large number of rod-shaped cells, and these cells can distinguish gray as long as there is a faint light, so the dog's night vision ability is better than that of humans.

However, dogs are nearsighted, which is about 150 degrees when converted into degrees, which means that the dog's eyesight is about 1 5 to 1 3 of a normal person. Although the eyesight is not very good, the dog's vision is much better than that of humans. Humans have a field of view of about 160-180 degrees, while dogs reach 200-290 degrees.

Guide dogs crossing traffic lights are not judged by color, red and green are gray in their eyes, they are distinguished by the light and shade of gray, so as to be able to correctly judge the traffic light.

Guide dogs do not judge the color of the traffic light, but rely on the brightness of the traffic light to guess the lead. This is because dogs cannot see red and green, but in their eyes, they can distinguish different grays, and they are very discerning of subtle changes in gray shades. Guide dogs do not judge the color of the traffic light, but rely on the brightness of the red green light to distinguish it.

This is because dogs cannot see red and green, but in their eyes, different grays can be judged, and they have a strong ability to distinguish subtle changes in gray shades, and with this ability, they can distinguish the light and dark changes of objects, thus producing a three-dimensional visual image. Out of all animal categories, dogs have a moderate level of vision. The dog's eye adjustment ability is only one-fifth of that of humans, and for some fixed things, dogs can only see up to 50 meters, while for some dynamic things, dogs' visual field can capture up to 1,000 meters.

Guide dogs distinguish traffic lights based on the brightness and darkness of their colors. Dogs can't recognize red-green, they see gray as grey; Therefore, they are distinguished according to the shade of gray. Guide dogs crossing traffic lights are not judged by color, red and green are gray in their eyes, they are distinguished by the light and dark of gray, so as to be able to correctly judge the traffic light.

Since the discovery of color blindness by the British scientist Dalton in the 18th century, mankind has realized for the first time that not everyone sees the same colors in the world! Later, scientists discovered that many mammals were born with color blindness, such as the dogs that shovelers love! When we talk about color blindness in dogs, we compare it to humans, not that it really can't distinguish any colors.

First of all, let's explain what a cone cell is, which is a cell that senses bright light and color.

There are three types of cones in humans that allow us to see all the colors in the spectrum. Dogs only have two kinds of cones, which can only distinguish black, hunger white, gray, blue, purple, etc., but red and green cannot be recognized.

Dogs are short-sighted, which is about 150 degrees when converted into degrees, which means that the dog's vision is about 1 5 to 1 3 of a normal person. Although the eyesight is not very good, the dog's vision is much better than that of humans. Humans have a field of view of about 160-180 degrees, while dogs reach 200-290 degrees.

Many people may feel pitiful when they see dogs being short-sighted and colorblind. However, the dog is only 150 degrees short-sighted. Ladies and gentlemen, touch the thickness of your lenses first!

Guide dogs distinguish traffic lights by relying on the brightness of the two lights to distinguish, red light and green light are gray in their eyes, but different grays can be distinguished; In addition, it will also judge whether it is passable through the movements of other pedestrians around; If there is no one, it will be judged by observing the traffic flow on their own. How do guide dogs distinguish traffic lights? Guide dogs distinguish traffic lights by relying on the brightness of the two lights to distinguish, red light and green light are gray in their eyes, but different grays can be distinguished; In addition, it will also judge whether Bi Xun can pass through the actions of other pedestrians around; If there is no one, Changpeng will also judge by observing the traffic flow on his own.

Everyone knows that dogs are colorblind and can't distinguish colors; Guide dogs distinguish traffic lights are not by distinguishing red and green light, but rely on the brightness of the two lights to distinguish, although, red light and green light are gray in their eyes, but different gray can be distinguished, dogs have a strong ability to distinguish the subtle changes in gray shades, rely on this ability, rely on this ability, can distinguish the light and dark changes of objects, produce a three-dimensional visual image.

Guide dogs are "real" to be color blind, walking in hand because the dog has severe color weakness, but it does not rely on traffic lights to judge whether it can pass When there are other pedestrians around, guide dogs will choose to observe other people's movements. If most people choose to pass, the guide dog will convey the signal to the owner that it is okay to pass, otherwise it will continue to wait; If there are no pedestrians around, the guide dog will observe the traffic on its own, and when the direction of passage is confirmed, the guide dog will pass a signal to the owner.