Basic knowledge of boutique coffee yawning is equal to drinking coffee?

American scientists have found that yawning is not only a sign of boredom, but also helps cool the brain. The findings could explain many questions, such as why yawns are most common before and after waking up, why some diseases are characterized by yawning, and why breathing through the nose and cooling the forehead can stop yawning.

"the brain, like a computer, works most efficiently when the temperature is moderate," said Andrew Gallup, a scientist at the State University of Binghamton in New York, who led the study, Discovery Channel reported on the 15th. Our bodies also maximize the coolness of our brains. "

Andrew and colleagues studied a parakeet that lives in Australia. They divided the parakeet into three groups. The first group was in a rising temperature environment, the second group was in a higher temperature, and the last group was in a lower temperature. The experiment showed that the number of yawns in the latter two groups of parrots did not increase, while the first group of parrots yawned more than twice as often as normal.

"when the outside temperature exceeds the body temperature, the parrot does not yawn because the brain cannot cool itself by yawning and inhaling cold air," Andrew said. Do not yawn when the external environment is very cold, because the brain will inhale air much lower than the body temperature, which will cause it to suffer adverse stimulation. " Scientists now believe that birds and mammals yawn to cool the brain. If the external environment is cooler than the brain and body, inhaling air quickly can cool the blood flowing through the face and lower the temperature of the brain. Previous studies have shown that yawning can wake up the brain, and yawning early in the morning is tantamount to drinking a cup of coffee.

New research also explains why people tend to yawn when they are tired: physical drowsiness raises the temperature in the deep layers of the brain, prompting us to lower the brain temperature by yawning. In addition, yawning promotes the transition of the brain from one state to another, such as waking the brain from sleep.

People who yawn abnormally are likely to have a problem with the brain's temperature regulation system, and people with epilepsy yawn constantly before the attack, according to scientists. Yawning can also indicate that migraine sufferers will soon develop.