Why do we usually yawn? Sometimes if we see someone yawn, we tend to do the same. It seems it got under your nerves that you can’t get over with without yawning. It passes along from one person to another like a domino effect. One cannot be effected without even sensing and looking. Yawning is a reflex or an act of simultaneous inhalation or taking in the air and stretching of the eardrums, followed by a deep exhale. To adults, it occur naturally before and after sleep, during tedious activities and as a result of its contagious quality. Scientists still studying the facts about yawning like sleep. If how essential are they to human race. But no matter how little knowledge we know about yawning, it is known for its contagiousness. Studies claimed and explained why human yawn, even animals. Some discuss that yawning is associated with tiredness, stress, sleepiness, hunger and boredom yet an opposed study revealed it is a process of cooling off the brain from tedious activities and stress. Another fact is when a hungry person yawn. Why is that? Simply, when stomach gets empty the nerves inside intestine send a message to our brain that stomach needs to be filled with food again. In addition, when stress strike mind rumble. Yawn is a factor to relieve stress to feel relax.
Not only human yawn but animals as well like chimpanzees, dogs and can occur across species. In HowStuffWorks.com/ Howstuffwork Science published article, Does contagious yawning mean you’re nice? explained yawning is a phenomenon related to our predisposition toward empathy. The ability to understand and connect with others’ emotional state. A kid with an autism are less likely to catch yawns than other kids. A study show that it could help doctors to treat patients with autism. To understand them deeply and able to communicate and connect to others. Another study states that yawning occurs when blood contains increased amounts of carbon dioxide and that need of oxygen. It is a fact that reduce oxygen intake compared to normal respiration. Another study proposed that nervousness is a possible reason. It indicates the perception of an impending need for action. Anecdotal evidence suggests that yawning helps increase the state of alertness of a person.
As off yawning cooling off our brain and regulation of body temperature, in 2007 researchers from University of Albany discuss yawn a means to keep the brain temperature. They demonstrate an experiment that both subjects with cold packs attached to their foreheads and asked to breathe strictly nasally exhibited reduced contagious yawning when watching videos of people yawning. Another hypothesis about yawn is caused by chemical in the brain or called neurotransmitters that affect emotions, mood, appetite and other body phenomena. These chemicals are serotonin, dopamine, glutamic acid and nitric oxide. The more amount of these chemicals are activated in the brain, the frequency of yawning increases. A part of brain reduces the frequency of yawning is called endorphins.
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