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Is yawning really contagious? What's the scientific basis

It is often said that yawning can be contagious. In fact, it seems to be true. Is yawning really contagious? What is the scientific basis?

'yawning contagion' refers to a body language that humans have inherited from the ancestors of community life. In the ancient ape community, its repeated appearance expresses the meaning of 'I'm trapped'. The so-called 'infectious yawn' is actually 'yawn imitation', which is a psychological hint, which is different from cold infection. When you see others yawning, vision will stimulate the cerebral cortex and stimulate nerve reflex, which is an instinctive phenomenon.

It is often said that yawning is contagious. It does happen in life. As long as a person yawns, people around him will yawn one after another. Is yawning really contagious?

The experiment found that when scientists played yawning videos to some adults, 42% to 55% began to yawn. It seems that a considerable number of people will be infected by yawning. Yawning is a means used by the human body to automatically adjust the temperature of the brain. When the human brain begins to overheat, cool air enters the brain through the expansion and contraction of the maxillary sinus to cool the brain. Yawning is characterized by opening your mouth and taking a deep breath, while the muscles of your chin and body stretch out. In addition, breathing and yawning are controlled by different brain regions; When the oxygen concentration in the paraventricular nucleus of the hypothalamus decreases, people yawn.

'infectious yawn' is not limited to 'primate individuals' to express' I want to sleep'. In 2008, the research team led by Dr. Sanju of berkbeck college, University of London, found that human yawns can be transmitted to dogs. The experiment was done as follows: the experimental group: strangers call the name of pet dogs. When they turn to look at themselves, they yawn at them with both voice and color, and repeat the operation for 5 minutes.

Control group: the stranger called the pet dog's name. When he turned to look at himself, he opened his mouth towards him and repeated the operation for 5 minutes. Results: 29 dogs participated in the study. In the experimental group, 21 dogs yawned, with an average of 1.9 yawns in 5 minutes; The dogs in the control group did not yawn at all.