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We all love getting something new. But then we have to move around our current clutter 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 adulthood. 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 rodents, researchers watched what happens when they either prevented neurons from being born or made them sprout faster. They found that new neurons help move older memories out of the hippocampus and into long-term storage in the neocortex. Such shuffling, 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.

詞匯總結(jié)：

r （n） 混亂

His room is in a clutter so I have to tidy it up.? 他的房間亂七八糟的，我不得不整理一下。

（v）使發(fā)芽，長(zhǎng)芽

These potatoes have begun to sprout.? 這些馬鈴薯開(kāi)始發(fā)芽了。

短語(yǔ)總結(jié)：

around 遷徙

I'm not chase for wealth nor fame, just a freedom to move around, a wide space for me to fly.? 我追求的不是什么財(cái)富，不是什么名利，只是移動(dòng)的自由，廣闊的天空，任我翱翔。

room for 讓出

Can you make room for me?? 能騰出位子給我嗎？

up 空出來(lái)

They free up resources to be more efficiently used elsewhere.? 它們使資源開(kāi)放并在別處得到更有效的利用。

百科小知識(shí)：四個(gè)記憶高潮

清晨起床后，大腦經(jīng)過(guò)一夜休息，此刻學(xué)習(xí)一些難記憶而又必須記憶的東西較為適宜。這是第一個(gè)記憶高潮。上午8點(diǎn)至11點(diǎn)是第二個(gè)記憶高潮。此時(shí)體內(nèi)腎上腺素分泌旺盛，精力充沛，大腦具有嚴(yán)謹(jǐn)而周密的思考能力。第三個(gè)記憶高潮是下午6點(diǎn)至8點(diǎn)，不少人利用這段時(shí)間來(lái)回顧、復(fù)習(xí)全天學(xué)習(xí)過(guò)的東西，加深記憶，分門(mén)別類，歸納整理。睡前一小時(shí)，是記憶的第四個(gè)高潮。利用這段時(shí)間對(duì)難以記憶的東西加以復(fù)習(xí)，不易遺忘。