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Why are yawns 'contagious'

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Identifying with another's state of mind while they yawn may trigger an unconscious impersonation. ChaCha! [ Source: http://www.chacha.com/question/why-are-yawns-%27contagious%27 ]
More Answers to "Why are yawns 'contagious'"
Some people have a theory about why yawns are contagious, but it has since been proven incorrect. The theory goes like this... When you breathe, you take in carbon dioxide. Scientists used to think you yawned because you had too much Co2 in...
http://wiki.answers.com/Q/Why_are_yawns_contagious
I actually read something about this in an online article. When lets say "I" yawn because "you" have yawned it means that I am expressing sympathy to your condition and therefore must yawn with you. So those you yawn bec...
http://answers.yahoo.com/question/index?qid=20090206052951AAd1kUQ
Contagious yawning is real, scientists say, and it's "probably programmed into us," according to Dr. William Broughton, director of the Sleep Disorders Center at the University of South Alabama Knollwood Hospital. The action of a ...
http://www.answerbag.com/q_view/556953
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