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释放心灵,忘记不快

kira86 于2009-11-06发布 l 已有人浏览
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对于过去痛苦的记忆,年轻的大脑能忘记它们,但是年老的大脑则没有那么容易了。发表在《科学》(Science)杂志上的一项动物研
对于过去痛苦的记忆,年轻的大脑能忘记它们,但是年老的大脑则没有那么容易了。发表在《科学》(science)杂志上的一项动物研究发现,让大脑“返老还童,恢复其“韧性”或许是可行的。

freeing the mind to forget

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 erect 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 disorder. but young brains are much more resilient—and can even erase 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 flinch 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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