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Yawning is thought to cool the brain and make it more alert. Simultaneous yawning may occur when a group of people are all breathing the same warm, stale air. Or contagious yawning may have evolved to help groups remain vigilant against danger.

en.wikipedia.org/wiki/Yawn

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the ... This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles, and can occur across species. Approximately 20 ...

www.psychologytoday.com/blog/the-athletes-way/201403/why-is-yawning-so-contagious

Mar 16, 2014 ... About half of adults yawn after someone else yawns due to a universal phenomenon called “contagious yawning.” Researchers at Duke ...

www.psychologytoday.com/blog/neurologic/201601/why-is-yawning-contagious

Jan 11, 2016 ... Are you a victim of contagious yawning? It might reflect good attributes.

mentalfloss.com/article/64654/why-are-yawns-contagious

Studies have shown that seeing pictures or videos of yawning faces can provoke contagious yawning. What we might think of as the main component of a “yawn ...

www.smithsonianmag.com/science-nature/why-do-we-yawn-and-why-is-it-contagious-3749674

Jun 28, 2013 ... Pinpointing exactly why we yawn is a tough task, but the latest research suggests that our sleepy sighs help to regulate the temperature of our ...

www.quora.com/Is-yawning-contagious-If-so-why-Whats-the-evidence

You're definitely not alone. About half of adults yawn after someone else yawns due to a universal phenomenon called “contagious yawning.” Try this test out ...

www.seeker.com/why-is-yawning-contagious-1765108386.html

Sep 15, 2010 ... Contagious yawning gets at the ancient, deep, and subconscious roots of empathy and social bonding.

www.washingtonpost.com/news/speaking-of-science/wp/2016/10/03/dear-science-is-yawning-really-contagious

Oct 3, 2016 ... Yawning seems to be pretty much ubiquitous in the animal kingdom, and for some animals — many humans included — it really is contagious.

www.today.com/health/person-psychopath-yawn-might-help-you-tell-t40276

Jul 8, 2016 ... People high in psychopathic personality traits often don't "catch" the contagious yawn, a new study finds.