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Originally Posted by psychtracker
Not sure if you can gleam any great insights into that mini-experiment. I watched a bit of it on live feed, and they knew he was acting a bit weird, or up to a secret task...coz he kept mentioning - am i boring you etc... Corin & Steve where certainly just playing along with him - and gave a "token" yawn. Obviously yawning also varies on tiredness, warmth, lack of oxygen to the brain etc... Also, roughly half the population do not yawn contagiously.
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I think yawning is to do with tiredness, but why it is done is still a mystery I think. Logically it would seem to be about breathing more air in when maybe someone isn't doing enough of that.