Yawning is an unconditioned reflex, which is expressed in a deep and prolonged inhalation followed by a rapid exhalation. The reasons for the occurrence of yawning are not fully understood - there are several hypotheses about this. Why do people yawn?
Instructions
Step 1
According to one of the versions, yawning occurs during oxygen starvation of the brain. As a result of numerous studies, it has been found that in a state of fatigue, drowsiness or boredom, a person's breathing becomes less deep. As a result, carbon dioxide accumulates in the blood. It is the effect of this metabolic product that provokes yawning. Yawning, accompanied by a deep, slow breath, improves blood flow to the brain.
Step 2
According to American scientists, yawning is not only a sign of sleepiness or boredom. Rather, it is a complex process designed by nature to regulate the temperature of the brain. According to the theory of Professor Andrew Gallup, the work of the brain can be compared to the functioning of a computer - when "overheated", some malfunctions can occur. Yawning provides an influx of cold air and, as a result, the brain is normalized. In addition, this group of scientists argues that yawning not only does not contribute to immersion in sleep, but on the contrary, helps to drive away drowsiness and invigorate, focus or suppress the feeling of fear.
This conclusion is partly confirmed by observations of test pilots, athletes and artists - situations accompanied by strong emotional stress provoke yawning.
Step 3
Also, one of the reasons for yawning is the body's reaction to changes in atmospheric pressure. When you yawn, the middle ear cavity is ventilated, which is connected by the Eustachian tube to the pharynx. Thus, yawning, a person balances the internal pressure with the external, atmospheric.
Step 4
You should be aware that bouts of frequent and prolonged yawning can be a harbinger of some serious illnesses. Therefore, if they occur, you must consult a doctor.
