Li explained the phenomenon of yawning

Why can't we resist yawning after seeing others yawn? Scientists say it is the "yawning" phenomenon.

>>>The benefits are 'unbelievable' when you yawn

Before answering the question of why we are "yawning" , learn about the origin of the usual yawning behavior.

Researchers on the MNN site explained, yawning is an unintentional act, which causes your mouth to open and breathe deeply. When the air spills into the lungs, the abdominal muscles are pulled back and the diaphragm is pushed down. Yawning ends when you expel an air through your mouth. Many studies show that even fetuses in the womb are yawning, which proves to be unintentional.

Too much yawning can be a sign of heart disease.(Photo: MNN)

The question why humans and animals have yawning is a controversial issue for centuries. Some theories suggest that yawning is caused by oxygen deprivation or feeling boredom and drowsiness.

Research has recently discovered yawning is a way of the body to cool the brain . A 2007 study conducted at New York University in Albany concluded that people yawn more when the brain is likely to heat up.

The group of scientists conducted the study by understanding the phenomenon of yawning that is yawning spread from one person to another. They asked a group of research participants to go into their own rooms and watch videos of people who have behaviors that are unclear, such as laughing and yawning. Participants are required to breathe only through their noses or place ice packs on their heads, both of which cool the brain. In this case, yawning spreads from one person to another almost none. This may indicate that when the brain is cooled, people will not yawn.

Another question is why do people yawn, is it like other reflexes like coughing, sneezing, and contagious?

Scientists have long believed that yawning spread from one person to another is a sign of empathy . There are many studies that also show this. In particular, the more likely you are to 'catch a yawn' from someone, the more likely you are to be close to him. For example, you are more likely to get yawning from your husband than from a woman who happens to meet in a grocery store.

Particularly in children with autism (their sympathy is very weak), it seems unlikely to 'catch a yawn' from others. The cause is the decline of 'mirror neurons' or ' reflective cells' in the young brain, which play a role in responding to what's happening around.

Interestingly, yawning is not widespread in the animal world, because most animals do not have the same empathy as humans (except chimpanzees). But the dog itself has the ability to yawn after its owner yawns, proving that the animal is able to sense things around higher than other species. It is true and many dog ​​owners have confirmed that it is true.

Although yawning is harmless, excessive yawning can be a sign of heart attack or bleeding in and around the aorta (the heart's main artery) . If you often yawn in combination with some heart attack symptoms such as feeling something pressing on your chest makes it hard to breathe, go to the hospital immediately. Of course, too much yawning also shows you are too tired. If you suspect heart disease, let go of your body and try a nap.