https://www.steemimg.com/images/2016/09/27/bostesoe4dcc.jpg
By Daisuke Tashiro (Flickr) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons

For many  time the Yawn cause was unknown, then for some
long believed that fatigue could be attributed by oxygen deficiency, however
remains unclear.

According to a scientific study released by Gary Hack, university faculty
dentistry Maryland in Baltimore.

The Yawn is a mechanism which allows to cool our brains, we could say that
It is like the radiator fan of our car, now I understand why yawn after
much mental work a lot.

¿Do sinus mechanism that cools the brain?

This hypothesis is based on the sinuses are those that allow the ventilation
reaching the brain, this discovery was achieved when the authors of the research
hack and Andrew Gallup had the opportunity to dissect a body and observe more
thoroughly the mechanism linked to the sinuses that allows ventilation of the brain,
discovering that the posterior wall of the maxillary sinus was fine.

Studies of these scientists suggest that yawning is the mechanism that the body uses to
to lower its temperature.

Gallup test subjects using two female suffering chronic episodes of yawning
these patients was measured its temperature before appearing a new episode of yawn.

It was confirmed that before the episode of bosteso his temperature was high and immediately after
yawn decreased.

Importance of research on the causes of yawning

Knowing the true causes of yawn is very valuable, because the knowledge gained
It could be used to achieve know the causes of other problems such as very strong migraines,
factors that cause epilepsy, is impressive as the body can still keep many secrets
and that discovering those secrets can help many people.

Content
Human paranasal sinuses and selective brain cooling: A ventilation system activated by yawning?
Gallup, Andrew C. et al.
Medical Hypotheses , Volume 77 , Issue 6 , 970 - 973