Thursday, July 05, 2007

YAWNING COOLS THE BLOOD TO REFRESH YOUR BRAIN

Over the years, there have been many theories for why people yawn. It has been associated with sleepiness and boredom, and, incorrectly, with low oxygen levels in the blood.

"No one knows why we yawn," says Andrew C. Gallup, a psychology professor at the State University of New York at Albany.

Now Dr. Gallup and fellow researchers have a new explanation: yawning, they said, is a way for the body to cool the brain.

The volunteers were asked to step into a room by themselves and watch a video showing people behaving neutrally, laughing or yawning.

Some volunteers were asked to breathe only through their noses as they watched. Later, volunteers were asked to press warm or cold packs on their foreheads.

"The two conditions thought to promote brain cooling (nasal breathing and forehead cooling) practically eliminated contagious yawning," the researchers wrote.

The study may also help explain why yawning spreads from person to person. A cooler brain, Dr. Gallup said, is a clearer brain.

So yawning actually appears to be a way to stay more alert. And contagious yawning, he said, may have evolved to help groups remain vigilant against danger.

3 comments:

Rodrigo said...

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Rodrigo said...

Oi, achei teu blog pelo google tá bem interessante gostei desse post. Quando der dá uma passada pelo meu blog, é sobre camisetas personalizadas, mostra passo a passo como criar uma camiseta personalizada bem maneira. Se você quiser linkar meu blog no seu eu ficaria agradecido, até mais e sucesso. (If you speak English can see the version in English of the Camiseta Personalizada. If he will be possible add my blog in your blogroll I thankful, bye friend).

Camiseta Personalizada said...

Oi, achei teu blog pelo google tá bem interessante gostei desse post. Quando der dá uma passada pelo meu blog, é sobre camisetas personalizadas, mostra passo a passo como criar uma camiseta personalizada bem maneira. Se você quiser linkar meu blog no seu eu ficaria agradecido, até mais e sucesso.(If you speak English can see the version in English of the Camiseta Personalizada.If he will be possible add my blog in your blogroll I thankful, bye friend).

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