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SSS 2009-09-04

时间:2010-05-19 00:45来源:互联网 提供网友:mark@li   字体: [ ]
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Some things are hard to remember. Others are hard to forget—especially things that are traumatic. But kids, it turns out, are better than adults at forgetting the bad stuff. Now scientists think they know why. According to an animal study in the September 4th issue of the journal Science, the brains of adults erect1 physical barriers that keep painful memories intact.

As adults, events that emotionally disturb us tend to get seared into our brains. And those memories can resurface, causing anxiety, fear and even post-traumatic stress disorder2. But young brains are much more resilient—and can even erase3 unpleasant memories.

To get a better handle on this youthful forgetting, scientists studied the brains of young and old rats. They found that in adult brains, a physical net forms around certain cells in the amygdala, a structure associated with emotional memories. Adults that had been trained to associate a mild foot shock with a specific sound would flinch4 when they just heard the sound. But using a drug to dissolve this barrier restored the older rats’ ability to extinguish fearful memories. So rats that got the net-busting treatment stayed calm when they heard the sound.

One of the few instances where a net loss is a real gain.

 


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1 erect 4iLzm     
n./v.树立,建立,使竖立;adj.直立的,垂直的
参考例句:
  • She held her head erect and her back straight.她昂着头,把背挺得笔直。
  • Soldiers are trained to stand erect.士兵们训练站得笔直。
2 disorder Et1x4     
n.紊乱,混乱;骚动,骚乱;疾病,失调
参考例句:
  • When returning back,he discovered the room to be in disorder.回家后,他发现屋子里乱七八糟。
  • It contained a vast number of letters in great disorder.里面七零八落地装着许多信件。
3 erase woMxN     
v.擦掉;消除某事物的痕迹
参考例句:
  • He tried to erase the idea from his mind.他试图从头脑中抹掉这个想法。
  • Please erase my name from the list.请把我的名字从名单上擦去。
4 flinch BgIz1     
v.畏缩,退缩
参考例句:
  • She won't flinch from speaking her mind.她不会讳言自己的想法。
  • We will never flinch from difficulties.我们面对困难决不退缩。
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