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What makes us yawn and why does it seem to be contagious? ... Next time you're in a meeting, try this little experiment: Take a big yawn, cover your mouth out of courtesy, and watch and see how many people yawn. There's a good chance that you'll set off a chain reaction of yawns.
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www.howstuffworks.com/question572.htm
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These lower vertebrates don't show any other "feeling" communication behaviors (such as smiling, purring, crying, etc.) Thus it does not seem likely that they yawn as a communication device. This does not mean that humans don't use yawning to communicate feelings, but yawning certainly didn't originate for this reason.
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www.madsci.org/posts/archives/aug99/934846431.Gb.r.html
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Yawn - Wikipedia, the free encyclopedia
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A yawn (from the Middle English yanen , an alteration of yonen or yenen , which in turn comes from the Old English geonian ), is a reflex of simultaneous inhalation of air and stretching of ...
en.wikipedia.org/wiki/Yawn
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If you yawn in class, you'll probably notice a few other people will start yawning, too. Why is that? ... Everybody yawns — from unborn babies to the oldest great-grandparent. Animals do it, too. But why, exactly, do people and animals yawn? No one knows for sure. But there are many theories (ideas) about why people yawn.
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kidshealth.org/kid/talk/qa/yawn.html
kidshealth.org/kid/talk/qa/yawn.html
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Why do humans yawn? When someone is yawning, do you yawn too? Is yawning contagious? Learn all about the theories of why humans and animals yawn. ... Yawning is not limited to humans. Animals of all types yawn. If you have a dog or cat, you’ve probably seen your pet yawn several times. Even some birds yawn such as...
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www.chevroncars.com/learn/wondrous-world/yawn-contagiou...
www.chevroncars.com/learn/wondrous-world/yawn-contagious
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While the exact mechanism is unclear, many doctors believe low oxygen levels in the lungs trigger yawning in an effort to bring more O2 into the body. ... THE TRUTH IS that we don’t completely understand why people, or animals for that matter, yawn. It’s widely assumed that yawning occurs because we are tired or bored...
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www.msnbc.msn.com/id/3076713/
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"Most animals with backbones yawn and even some without. Dogs, cats, rats, snakes, fish, birds and humans all yawn. Fetuses at 11 weeks after conception yawn in utero."; Contact: 410-455-2419...
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www.uc.edu/news/ebriefs/yawn.htm
www.uc.edu/news/ebriefs/yawn.htm
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We yawn to stay together and synchronize our activities says Robert Provine, psychology professor at the University of Maryland Baltimore County, who's studied ... Humans yawn before they're born, even in the first trimester of prenatal development. Ultrasonic scanners catch fetuses yawning and hiccuping at 11 weeks.
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www.wonderquest.com/yawning.htm
www.wonderquest.com/yawning.htm
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The contagious yawn may have developed as a reflex to the sight of another human warning yawn. It is not certain how yawning is related to boredom but when activity level is reduced or voluntary movements restricted, intake of oxygen is reduced.
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niazi.com/Neurons/body.htm
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