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Makes A Yawn Contagious

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Answers to Common Questions
No one has come up with a convincing explanation for why yawns are contagious, but chimpanzees have the same problem! ChaCha!
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It is possible that yawns are contagious because at one time in evolutionary history, the yawn served to coordinate the social behavior of a group of animals. When one member of the group yawned to signal an event, all the other members of ...
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Yawning is extremely contagious -- 55% of people who witness someone yawn will yawn within five minutes. If a visually impaired person hears a tape of someone yawning, he or she is likely to yawn as well. Face it, the likelihood of you maki...
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Answers to Other Common Questions
I personally think it comes with our capacity to mimic or mirror others. I see, and sometimes fight, similar things myself. When another at my table sips a drink, suddenly I'm thirsty. The others cross the left leg over the right and I have...
http://answers.yahoo.com/question/index?qid=20100111183...
Research suggests contagious yawning is linked to psychological traits, or possibly linked to empathy & affinity for social cues.
http://www.chacha.com/question/what-is-it-that-makes-ya...