Discover: Yawn or because the brain is overheated Vary with season

Discover: Yawn or because the brain is overheated Vary with season
Discover: Yawn or because the brain is overheated Vary with season
People according to Xinhua News Agency often think and yawn because sleepy or weariness. American researchers find, it may be overheated sign of the brain too to yawn, people breathe external air in for the brain to cool through yawning. Turn with season into the attitude of university student in Princeton of U.S.A. and learn and evolve Gallup of biological post-doctor, Andrew of institute, and lead the research group, study the influence that season yawns to people. Researchers stop 80 pedestrians in Tucson of Arizona State at random, show the picture yawning to them, observe whether the pedestrian follows to yawn. Test carries on once respectively in winter and summer separately. The result reveals, half the research objects follow to yawn in winter, only 1/4 of the research objects are " infected " in summer . The intersection of U.S.A. and daily scientific website quote Gallup report 20, in decades in the past, researchers propose a great deal of assumptions to the controlling mechanism yawning, but scarely have and study and announce the biological function of yawning, the purpose or function to yawn does not have unanimous conclusion yet, " this research for the controlling mechanism of yawning this kind of view of involving the physiological function of body heat regulation has been offered and supported more " . Result of study this " evolve in the scientific front of nerve ", deliver by whom this month publish. Confirm and suppose that supposes, yawning and rising from brain temperature causes according to body heat regulation. The result of study reveals, before and after yawning, little mouse's brain temperature changed before. While yawning, the lower jaw has drawn and increased the blood flow of flowing into the brain, the blood flow and external air that sucks carry on the exchange of heat, help the brain to lower the temperature finally. According to this assumption, there should be reaction to yawn, namely when the external air temperature is equal to or higher than the body temperature, unable cooling brain of air yawning and sucking. This is confirmed in research of Gallup. The external temperature is equal to even higher than the body temperature in summer, helpless to letting the overheated brain have a rest, so the research object yawns the frequency is reduced. Promote understanding to suppose, when the ambient temperature is in a certain limit according to body heat regulation, the frequency top of yawning is high. Gallup says, their result of study is identical with the assumption. Consider humidity, stay outdoor time, the intersection of sleep and time,etc. behind the factor synthetically, no matter summer or winter, research object reach outdoor 5 minute for the first time, nearly 40% yawn, subsequently, the research object yawns the proportion is dropped to under 10% in summer, winter yawn the proportion rises more. He says: "These the first reveal that yawn in the report that the frequency varied with season. " Researchers think, this research has increased people's physiological knowledge, helpful explanation people are in the hyperpyrexia environment easy thinking is confused, reason at a loss, help to understand the neuronal disease of sports better or why the epilepsy patient often yawn.


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