Why do people yawn? and why is yawning contagious?
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I don't know but reading this makes me want to yawn.
I remember in some Bio class someone doing an experiment and saying it was some subconscious thing where we think we need more oxygen because the other person is taking ours. Who knows though?? Do animals yawn when another animal yawns too??
They yawn because they are tired. ;) LOL..Idk!!
No one really knows why yawning is "contagious". Or why we yawn at all. One popular explanation is that yawning allows you to get rid of too much carbon dioxide in your system and increase your oxygen supply. This was disproved by Dr. Robert Provine and his research team in 1987.
Yawning is caused by not enough oxygen around in our brain, and we yawn to increase the oxygen uptake into our body. Because of the sudden drop in oxygen level outside after we yawn, thus this makes everyone around us yawn too to increase the oxygen level in their bodies. Hence...the word 'contagious'.
Ok here's my shot at it. We yawn because we lack oxygen, I believe this to be true. The reason, however, that it seems contagious is due to evolution. In the wild, when monkeys feel in danger they make the same face as us humans when we yawn, which the monkeys then spread throughout the trees. So the reason we feel the need to yawn when someone else does is to spread the same message. Just one humble persons opinion.
I think it has to do with air in your brain or whatever.haha just talking about this made me yawn xD
Howstuffworks.com has an interesting article on this. Check it out.
http://www.howstuffworks.com/question572...
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