打哈欠的目的在于为大脑降温
<p><span word="It">It</span>'<span word="s">s</span> <span word="easy">easy</span> <span word="to">to</span> <span word="be">be</span> <span word="offended">offended</span> <span word="when">when</span> <span word="a">a</span> <span word="colleague">colleague</span> <span word="yawns">yawns</span> <span word="while">while</span> <span word="you">you</span>'<span word="re">re</span> <span word="talking">talking</span>. <span word="But">But</span> <span word="that">that</span> <span word="yawn">yawn</span> <span word="may">may</span> <span word="not">not</span> <span word="mean">mean</span> <span word="what">what</span> <span word="you">you</span> <span word="think">think</span>.</p><p>人们很容易会被这样一种行为惹恼：当你说话的时候，你的同事却在打着哈欠。但对于这个哈欠，也可能是你想得太多了。</p><p><span word="A">A</span> <span word="growing">growing</span> <span word="number">number</span> <span word="of">of</span> <span word="researchers">researchers</span> <span word="believe">believe</span> <span word="the">the</span> <span word="purpose">purpose</span> <span word="of">of</span> <span word="this">this</span> <span word="little">little</span>-<span word="understood">understood</span> <span word="behavior">behavior</span> <span word="is">is</span> <span word="to">to</span> <span word="cool">cool</span> <span word="the">the</span> <span word="brain">brain</span>, <span word="says">says</span> <span word="a">a</span> <span word="research">research</span> <span word="review">review</span> <span word="published">published</span> <span word="earlier">earlier</span> <span word="this">this</span> <span word="year">year</span> <span word="in">in</span> <span word="Frontiers">Frontiers</span> <span word="in">in</span> <span word="Neuroscience">Neuroscience</span>.</p><p>今年早些时候发表在《神经科学前沿》(<span word="Frontiers">Frontiers</span> <span word="in">in</span> <span word="Neuroscience">Neuroscience</span>)上的一项研究综述称，越来越多的研究人员认为，打哈欠这种人们对其还知之甚少的行为，其目的在于为大脑降温。</p><p><span word="Changes">Changes</span> <span word="in">in</span> <span word="climate">climate</span> <span word="affect">affect</span> <span word="how">how</span> <span word="often">often</span> <span word="people">people</span> <span word="yawn">yawn</span>. <span word="Researchers">Researchers</span> <span word="in">in</span> <span word="an">an</span> <span word="earlier">earlier</span> <span word="study">study</span> <span word="conducted">conducted</span> <span word="outdoor">outdoor</span> <span word="interviews">interviews</span> <span word="with">with</span> <span word="two">two</span> <span word="groups">groups</span> <span word="of">of</span> <span word="people">people</span> <span word="in">in</span> <span word="Tucson">Tucson</span>, <span word="Ariz">Ariz</span>., <span word="one">one</span> <span word="in">in</span> <span word="early">early</span> <span word="summer">summer</span> <span word="and">and</span> <span word="one">one</span> <span word="in">in</span> <span word="the">the</span> <span word="winter">winter</span>. <span word="People">People</span> <span word="were">were</span> <span word="asked">asked</span> <span word="to">to</span> <span word="look">look</span> <span word="at">at</span> <span word="pictures">pictures</span> <span word="of">of</span> <span word="people">people</span> <span word="yawning">yawning</span> <span word="and">and</span> <span word="talk">talk</span> <span word="about">about</span> <span word="their">their</span> <span word="own">own</span> <span word="yawning">yawning</span> <span word="behavior">behavior</span>.</p><p>气候的变化会影响到人们打哈欠的频率。研究人员在之前的一次研究中对亚利桑那州图森市(<span word="Tucson">Tucson</span>)的两组人进行了户外采访，一次是在初夏，另一次是在冬天。研究人员让被访者看了一些人们打哈欠的照片，并谈了谈他们自己的打哈欠行为。</p><p><span word="People">People</span> <span word="were">were</span> <span word="nearly">nearly</span> <span word="twice">twice</span> <span word="as">as</span> <span word="likely">likely</span> <span word="to">to</span> <span word="yawn">yawn</span> <span word="when">when</span> <span word="they">they</span> <span word="were">were</span> <span word="surveyed">surveyed</span> <span word="during">during</span> <span word="the">the</span> <span word="winter">winter</span>, <span word="when">when</span> <span word="they">they</span> <span word="could">could</span> <span word="inhale">inhale</span> <span word="cool">cool</span> <span word="air">air</span> <span word="to">to</span> <span word="reduce">reduce</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="says">says</span> <span word="the">the</span> <span word="study">study</span>, <span word="published">published</span> <span word="in">in</span> 2011 <span word="in">in</span> <span word="Frontiers">Frontiers</span> <span word="in">in</span> <span word="Evolutionary">Evolutionary</span> <span word="Neuroscience">Neuroscience</span>. <span word="Participants">Participants</span> <span word="yawned">yawned</span> <span word="less">less</span> <span word="when">when</span> <span word="surveyed">surveyed</span> <span word="in">in</span> <span word="the">the</span> <span word="early">early</span> <span word="summer">summer</span>, <span word="when">when</span> <span word="temperatures">temperatures</span> <span word="outdoors">outdoors</span> <span word="were">were</span> <span word="about">about</span> <span word="the">the</span> <span word="same">same</span> <span word="as">as</span> <span word="the">the</span> <span word="human">human</span> <span word="body">body</span>.</p>
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