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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.
Originally posted by randomname
Most people who stick their tongue out while doing simple tasks like breathing are mentally deficient.
And if you see someone walking around with crutches and their tongue sticking out you'd assume they where a member of a special Olympic team.
I don't if this thread was a form of mocking the mentally challenged or are you being serious.