60秒科学:Finding Room for New Memories

Finding Room for New Memories

A study in the journal Cell shows that the formation of new memories requires the movement of other memories located in the hippocampus to long-term storage in the neocortex. Karen Hopkin reports

We all love getting something new. But then we have to move around our current clutter¹ to find a place for it. Well, looks like things work the same way in the brain. Because according to a study published in the journal Cell, newborn neurons in the brain’s memory center make room for new memories by moving out the old ones.

Ten years ago, scientists discovered that the brain makes new neurons well into adulthood². These cells arise in the hippocampus, a brain region associated with learning and memory. So everyone figured these new neurons must help make new memories, although no one knew how.

Working with rodents³, researchers watched what happens when they either prevented neurons from being born or made them sprout⁴ faster. They found that new neurons help move older memories out of the hippocampus and into long-term storage in the neocortex. Such shuffling⁵, they think, may free up space in the hippocampus and increase its capacity for taking in something new. The new memories in the study happened to be fearful ones, but the researchers think the process applies to all memories stored in the hippocampus. Which means your brain is probably moving stuff around right now so you can remember this story.
 

1 clutter   

n.零乱，杂乱；vt.弄乱，把…弄得杂乱

参考例句：

• The garage is in such a clutter that we can't find anything.车库如此凌乱，我们什么也找不到。
• We'll have to clear up all this clutter.我们得把这一切凌乱的东西整理清楚。

2 adulthood   

n.成年，成人期

参考例句：

• Some infantile actions survive into adulthood.某些婴儿期的行为一直保持到成年期。
• Few people nowadays are able to maintain friendships into adulthood.如今很少有人能将友谊维持到成年。

3 rodents   

n.啮齿目动物( rodent的名词复数 )

参考例句：

• Rodents carry diseases and are generally regarded as pests. 啮齿目动物传播疾病，常被当作害虫对待。 来自《简明英汉词典》
• Some wild rodents in Africa also harbor the virus. 在非洲，有些野生啮齿动物也是储毒者。 来自辞典例句

4 sprout   

n.芽，萌芽；vt.使发芽，摘去芽；vi.长芽，抽条

参考例句：

• When do deer first sprout horns?鹿在多大的时候开始长出角？
• It takes about a week for the seeds to sprout.这些种子大约要一周后才会发芽。

5 shuffling   

adj. 慢慢移动的, 滑移的 动词shuffle的现在分词形式

参考例句：

• Don't go shuffling along as if you were dead. 别像个死人似地拖着脚走。 来自英汉文学 - 嘉莉妹妹
• Some one was shuffling by on the sidewalk. 外面的人行道上有人拖着脚走过。 来自英汉文学 - 嘉莉妹妹