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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.

Yawn - Wikipedia

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, birds, and reptiles...

Dear Science: Is yawning really contagious? - The Washington Post

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.

Why Is Yawning So Contagious? | Psychology Today

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

Mar 16, 2014 ... ... “Individual Variation in Contagious Yawning Susceptibility Is Highly ... Contagious yawning is a phenomenon that only occurs in humans and ...

Is yawning contagious? If so, why? What's the evidence? - Quora

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

Update (Jan 2016): I wrote this answer several years ago. Though it currently has accumulated ... Do you all have any theories as to why yawning is contagious? Is yawning contagious for blind people? Is yawning healthy? Jonathan Gouveia ...

Why Are Yawns Contagious? | Mental Floss

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

Jun 11, 2015 ... Yawning feels good, so why not join in when someone else yawns? Well, you're not really “joining in,” because you aren't copying the yawn on ...

Does contagious yawning mean you're nice? | HowStuffWorks

science.howstuffworks.com/life/contagious-yawn.htm

Contagious yawning is associated with the same parts of the brain that deal with ... You don't need to actually see a person yawn to involuntarily yawn yourself; ...

Is that person a psychopath? A yawn might help you tell - TODAY.com

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

Jul 8, 2016 ... Contagious yawning — or yawning when you see someone else do it — is a very primitive form of communication and bonding, Rundle says.

"Contagious" Yawning Occurs More Among Loved Ones

news.nationalgeographic.com/news/2011/11/111213-contagious-yawning-health-science-empathy-evolution/

Dec 15, 2011 ... So-called contagious yawning is a type of psychological effect that ... study marks the first time scientists have actually observed the connection.

Contagious Yawning: Evidence of Empathy? - Scientific American ...

blogs.scientificamerican.com/thoughtful-animal/contagious-yawning-evidence-of-empathy/

May 17, 2012 ... Contagious yawning - the increase in likelihood that you will yawn after ... Since chimpanzees are highly territorial and overtly aggressive ...