普林斯顿研究表明打哈欠有益健康
<p><span word="We">We</span> <span word="most">most</span> <span word="associate">associate</span> <span word="yawning">yawning</span> <span word="with">with</span> <span word="boredom">boredom</span> <span word="or">or</span> <span word="being">being</span> <span word="sleepy">sleepy</span>, <span word="but">but</span> <span word="new">new</span> <span word="research">research</span> <span word="suggests">suggests</span> <span word="it">it</span> <span word="can">can</span> <span word="be">be</span> <span word="good">good</span> <span word="for">for</span> <span word="your">your</span> <span word="health">health</span> - <span word="by">by</span> <span word="cooling">cooling</span> <span word="down">down</span> <span word="your">your</span> <span word="brain">brain</span>。</p><p>据英国《每日邮报》9月20日报道，人们把多把打哈欠和无聊与瞌睡联系在一起，但一项新研究表明，打哈欠可以给人脑“降温”，有益健康。</p><p><span word="Scientists">Scientists</span> <span word="at">at</span> <span word="Princeton">Princeton</span> <span word="University">University</span> <span word="found">found</span> <span word="a">a</span> <span word="big">big</span> <span word="yawn">yawn</span> <span word="can">can</span> <span word="regulate">regulate</span> <span word="the">the</span> <span word="temperature">temperature</span> <span word="of">of</span> <span word="the">the</span> <span word="brain">brain</span> <span word="and">and</span> <span word="prevent">prevent</span> <span word="over">over</span>-<span word="heating">heating</span>。</p><p>普林斯顿大学的科学家发现，打一个大大哈欠可以调节人脑温度，避免人脑过热。</p><p><span word="During">During</span> <span word="winter">winter</span>, <span word="Professor">Professor</span> <span word="Andrew">Andrew</span> <span word="Gallup">Gallup</span> <span word="and">and</span> <span word="his">his</span> <span word="team">team</span> <span word="asked">asked</span> 80 <span word="random">random</span> <span word="pedestrians">pedestrians</span> <span word="to">to</span> <span word="look">look</span> <span word="at">at</span> <span word="images">images</span> <span word="of">of</span> <span word="people">people</span> <span word="yawning">yawning</span> <span word="and">and</span> <span word="then">then</span> <span word="recorded">recorded</span> <span word="whether">whether</span> <span word="they">they</span> <span word="yawned">yawned</span> <span word="in">in</span> <span word="response">response</span>. <span word="They">They</span> <span word="then">then</span> <span word="performed">performed</span> <span word="the">the</span> <span word="same">same</span> <span word="trial">trial</span> <span word="in">in</span> <span word="the">the</span> <span word="summer">summer</span>。</p><p>安德鲁·盖洛普教授和他的团队在冬天随机测试了80名路人，让他们看关于人们打哈欠的图像，记录他们是否以打哈欠回应，他们在夏天也做了相同的试验。</p><p><span word="The">The</span> <span word="researchers">researchers</span> <span word="found">found</span> <span word="that">that</span> <span word="half">half</span> <span word="of">of</span> <span word="the">the</span> <span word="participants">participants</span> <span word="yawned">yawned</span> <span word="in">in</span> <span word="winter">winter</span> <span word="while">while</span> <span word="only">only</span> <span word="a">a</span> <span word="quarter">quarter</span> <span word="yawned">yawned</span> <span word="in">in</span> <span word="summer">summer</span>. <span word="You">You</span> <span word="may">may</span> <span word="think">think</span> <span word="people">people</span> <span word="would">would</span> <span word="tend">tend</span> <span word="to">to</span> <span word="cool">cool</span> <span word="the">the</span> <span word="brain">brain</span> <span word="by">by</span> <span word="yawning">yawning</span> <span word="more">more</span> <span word="in">in</span> <span word="summer">summer</span>. <span word="But">But</span> <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="theory">theory</span>, <span word="yawning">yawning</span> <span word="cools">cools</span> <span word="the">the</span> <span word="brain">brain</span> <span word="via">via</span> <span word="a">a</span> <span word="heat">heat</span> <span word="exchange">exchange</span> <span word="with">with</span> <span word="cooler">cooler</span> <span word="air">air</span>. <span word="This">This</span> <span word="system">system</span> <span word="therefore">therefore</span> <span word="wouldn">wouldn</span>'<span word="t">t</span> <span word="work">work</span> <span word="on">on</span> <span word="a">a</span> <span word="scorching">scorching</span> <span word="summer">summer</span>'<span word="s">s</span> <span word="day">day</span>。</p><p>研究人员发现，在冬天，一半参与者都会打哈欠，而在夏天打哈欠的受试者只有25%。也许人们会认为，人在夏天时更倾向于给脑子降温，但是，根据该理论，打哈欠得通过和较冷的空气进行热传导才能降低人脑温度。因此，该系统无法在闷热的夏天发挥作用。</p>
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