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What a lovely family, Neil. Who do they take after?I heard that the sticking the tongue out thing had something to do with 'rejecting' something unpleasant - like a bad tasting object in your mouth; you push it out with your tongue. Sounded like a reasonable explanation.
Just PMSL at this.My wife is playing the Wii with the kids and straight away the toungue went out.Life will never be the same again 
It's also noticeable that some people walk more slowly when they are thinking of something difficult
you could search http://www.urbandictionary.com/ for that answer neilep 
Everyone seems to like this answer:When you are concentrating on something, you are using the hemisphere of the brain also used for processing motor input. It's also noticeable that some people walk more slowly when they are thinking of something difficult. This is caused by interference from the two activities fighting for the same bit of brain to process them. By biting your lip or sticking your tongue out, you are suspending motor activity and keeping your head rigid, to minimise movement and hence interference.http://www.smh.com.au/articles/2003/12/05/1070351773514.html?from=storyrhs
Surely it's easier for us to not bother to stick our tongues out?So why go to the trouble when what you are trying to do is conserve resources.I prefer another answer. People stick their tongues out to show that they are unhappy about things- children do this a lot (most adults have learned that it's not polite). Gorillas do it too.I think that the tongue sticking out of the corner of the mouth is a signal that people should go away and leave you to think.
Why do I stick out my tongue when I concentrate?Much of your brain is devoted to your tongue. It is a huge muscle, constantly moving, that has to keep out of the way of your teeth, help you swallow and avoid choking you. Itís covered with densely packed touch receptors that constantly update the mental map of the shape of your mouth. And your tongue is connected to the brainís language centres so it often moves to partly form word shapes as you think. All this sends a huge stream of data to your brain. Sticking your tongue out or biting it, reduces its movement and cuts down on this torrent, which leaves more brain-power available to concentrate.