英语六级阅读精讲：过多的压力让你的记忆力衰退
<p> <span word="Scientists">Scientists</span> <span word="claim">claim</span> <span word="to">to</span> <span word="have">have</span> <span word="solved">solved</span> <span word="the">the</span> <span word="mystery">mystery</span> <span word="of">of</span> <span word="how">how</span> <span word="stress">stress</span> <span word="contributes">contributes</span> <span word="to">to</span> <span word="memory">memory</span> <span word="loss">loss</span> <span word="in">in</span> <span word="old">old</span> <span word="age">age</span>.</p><p> <span word="Researchers">Researchers</span> <span word="at">at</span> <span word="Edinburgh">Edinburgh</span> <span word="University">University</span> <span word="have">have</span> <span word="shown">shown</span> <span word="how">how</span> <span word="two">two</span> <span word="receptors">receptors</span> <span word="in">in</span> <span word="older">older</span> <span word="brains">brains</span> <span word="react">react</span> <span word="to">to</span> <span word="the">the</span> <span word="stress">stress</span> <span word="hormone">hormone</span> <span word="cortisol">cortisol</span>, <span word="which">which</span> <span word="has">has</span> <span word="been">been</span> <span word="linked">linked</span> <span word="to">to</span> <span word="memory">memory</span> <span word="loss">loss</span> <span word="in">in</span> <span word="the">the</span> <span word="elderly">elderly</span>.</p><p> 科学家们表明他们已经揭开了压力如何导致老年记忆衰退之秘。爱丁堡大学的研究者解释了两个老化的大脑感受器如何对应激激素皮质醇作出反应，这跟老年记忆衰退有关。</p><p> <span word="The">The</span> <span word="study">study</span> <span word="found">found</span> <span word="that">that</span> <span word="one">one</span> <span word="receptor">receptor</span> <span word="was">was</span> <span word="activated">activated</span> <span word="by">by</span> <span word="low">low</span> <span word="levels">levels</span> <span word="of">of</span> <span word="cortisol">cortisol</span>, <span word="which">which</span> <span word="helped">helped</span> <span word="memory">memory</span>.</p><p> 研究发现一个感受器被低水平的皮质醇所激活，有助于记忆力。</p><p> <span word="However">However</span>, <span word="once">once</span> <span word="levels">levels</span> <span word="of">of</span> <span word="the">the</span> <span word="hormone">hormone</span> <span word="were">were</span> <span word="too">too</span> <span word="high">high</span> <span word="they">they</span> <span word="spilled">spilled</span> <span word="over">over</span> <span word="on">on</span> <span word="to">to</span> <span word="a">a</span> <span word="second">second</span> <span word="receptor">receptor</span>, <span word="activating">activating</span> <span word="brain">brain</span> <span word="processes">processes</span> <span word="which">which</span> <span word="contribute">contribute</span> <span word="to">to</span> <span word="memory">memory</span> <span word="impairment">impairment</span>.</p><p> 然而，一旦激素水平过高，就会溢出洒向第二个感受器，激活大脑运作导致记忆障碍。</p><p> <span word="When">When</span> <span word="the">the</span> <span word="receptor">receptor</span> <span word="linked">linked</span> <span word="to">to</span> <span word="poor">poor</span> <span word="memory">memory</span> <span word="was">was</span> <span word="blocked">blocked</span>, <span word="the">the</span> <span word="memory">memory</span> <span word="recall">recall</span> <span word="problem">problem</span> <span word="was">was</span> <span word="reversed">reversed</span>.</p><p> 当连接到健忘的感受器被阻塞，记忆恢复问题就会被改变。</p><p> <span word="The">The</span> <span word="experiment">experiment</span> <span word="based">based</span> <span word="on">on</span> <span word="older">older</span> <span word="mice">mice</span> <span word="navigating">navigating</span> <span word="a">a</span> <span word="maze">maze</span>, <span word="was">was</span> <span word="published">published</span> <span word="in">in</span> <span word="the">the</span> <span word="Journal">Journal</span> <span word="of">of</span> <span word="Neuroscience">Neuroscience</span>.</p><p> <span word="The">The</span> <span word="research">research</span> <span word="helps">helps</span> <span word="explain">explain</span> <span word="why">why</span> <span word="too">too</span> <span word="much">much</span> <span word="stress">stress</span> <span word="over">over</span> <span word="a">a</span> <span word="prolonged">prolonged</span> <span word="period">period</span> <span word="interferes">interferes</span> <span word="with">with</span> <span word="the">the</span> <span word="normal">normal</span> <span word="processes">processes</span> <span word="in">in</span> <span word="storing">storing</span> <span word="everyday">everyday</span> <span word="memories">memories</span>.</p>
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