There are many mysteries in medicine, but one human and animal behavior that has been observed for years but is poorly understood, is yawning. It is easy to define since it is so common. It is a form of reflex that involves a deep inspiration, opening the jaw wide, and a rapid exhalation of the inspired air. There is generally a feeling of relaxation immediately after the yawn
Answering this question is not nearly as easy as defining the action. There are a number of theories about why we yawn, but remarkably little good research on this topic. There are several agreed upon causes for yawning, however.
First, it that when changing elevation rapidly as in an airplane, you will both voluntarily (on purpose) yawn and also involuntarily (not on purpose) yawn to try and equalize pressures within your ear. This works and is an accepted reason for yawning.
Another indisputable cause of yawning is called social empathy. What this means in plain English is “suggestion.” If you see someone yawn, or if you read about yawning (like right now reading this column) some people will yawn. In fact psychologists have proven that the more empathetic you are, the more likely you are to yawn when someone else does. There has been fascinating research about the hierarchy of this suggestion. If you are very close to a person emotionally, you will yawn if they do. The rank order of this suggestion is family, friend, stranger. The closer one is to the person who yawns, the more likely one is to yawn as well.
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