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Merely thinking about or seeing someone yawning can make you yawn. But why?
There are a number of theories that attempt to explain why humans and other animals yawn. [20] [21] [22] One study states that yawning occurs when one's blood contains increased amounts of carbon dioxide and therefore becomes in need of the influx of oxygen (or expulsion of carbon dioxide) that a yawn can provide. [20]
According to the BBC, previous studies suggesting contagious yawning shows how empathetic you are may not be that concrete. And here we thought we were all just super nice people. Show comments
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Yawning is a reflex that tends to disrupt the normal breathing rhythm and is believed to be contagious as well. [14] The reason why we yawn is unknown. A common belief is that yawns are a way to regulate the body's levels of O 2 and CO 2, but studies done in a controlled environment with different levels of O 2 and CO 2 have disproved that ...
During faucalized voice, the sides of pharynx expand outward and the larynx descends and tilts forward. The term "yawny voice" is appropriate to compare this voice quality to the physiological act of yawning. Its opposite is harsh voice, a vocal quality produced when the pharynx is contracted and the larynx raised.
This explains why people with medical conditions that cause an increased core body temperature like multiple sclerosis (MS), epilepsy, anxiety, and head trauma experience excessive yawning ...
This is a more accurate defenition of a yawn and animals that perform yawning. Stretching the eardrums is only a small part of the yawn and refers to one specific hypothesis (middle ear clearing). This is considered a side-effect by many scientists in the field of yawning, thus I would not state it in the defenition. Thank you again!