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Originally Posted by Tormod
That's a very good question. I saw a documentary on Discovery Channel about that...how mammals yawn and how it is contageous...it said that it has social functions as well as physical functions but as for *why* we yawn I am not sure.  |
Tormod; I believe that the yawn response is brought on by the body's need to increase the oxygen level in the blood. I don't remember where or how I came across this information, but it was a reliable source. As for why it seems to be contageous, for that I have no answer other than it may have something to do with mental suggestion.
