Common belief is that yawning（打哈欠） helps to increase the oxygen supply. However, previous research has failed to show an association between yawning and blood oxygen levels. New research by a team of researchers led by Psychologist Andrew Gallup of SUNY College at Oneonta, USA now reveals that yawning cools the brain. Sleep cycles, cortical arousal and stress are all associated with fluctuations1 in brain temperature, Yawning subsequently functions to keep the brain temperature balanced and in optimal2 homeostasis（体内平衡）. According to this theory, yawning should also be easily manipulated by ambient temperature variation, since exchange with cool ambient air temperature may facilitate lowering brain temperature. Specifically, the researchers hypothesized that yawning should only occur within an optimal range of temperatures, i.e., a thermal3 window.To test this, Jorg Massen and Kim Dusch of the University of Vienna measured contagious4（感染性的） yawning frequencies of pedestrians5 outdoors in Vienna, Austria, during both the winter and summer months, and then compared these results to an identical study conducted earlier in arid6 climate of Arizona, USA. Pedestrians were asked to view a series of images of people yawning, and then they self-reported on their own yawning behavior.Results showed that in Vienna people yawned more in summer than in winter, whereas in Arizona people yawned more in winter than in summer. It turned out that it was not the seasons themselves, nor the amount of daylight hours experienced, but that contagious yawning was constrained7 to an optimal thermal zone or range of ambient temperatures around 20o C. In contrast, contagious yawning diminished when temperatures were relatively8 high at around 37o C in the summer of Arizona or low and around freezing in the winter of Vienna. Lead author Jorg Massen explains that where yawning functions to cool the brain, yawning is not functional9 when ambient temperatures are as hot as the body, and may not be necessary or may even have harmful consequences when it is freezing outside.While most research on contagious yawning emphasizes the influence of interpersonal and emotional-cognitive variables on its expression, this report adds to accumulating research suggesting that the underlying10 mechanism11 for yawning, both spontaneous and contagious forms, is involved in regulating brain temperature. In turn, the cooling of the brain functions to improve arousal and mental efficiency. The authors of this study suggest that the spreading of this behavior via contagious yawning could therefore function to enhance overall group vigilance.
点击收听单词发音
1 fluctuations 波动，涨落，起伏 参考例句： He showed the price fluctuations in a statistical table. 他用统计表显示价格的波动。 There were so many unpredictable fluctuations on the Stock Exchange. 股票市场瞬息万变。
相关文章推荐
