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1、*第二十四篇 Sleep Lets Brain File MemoriesTo sleep. Perchance to file? Findings published online this week by the Proceedings of the National Academy of Sciences further support the theory that the brain organizes and stows memories formed during the day while the rest of the body is catching zzzs.Gyorgy
2、 Buzsaki of Rutgers University5 and his colleagues analyzed the brain waves of sleeping rats and mice. Specifically, they examined the electrical activity emanating from6 the somatosensory neocortex (an area that processes sensory information) and the hippocampus, which is a center for learning and
3、memory. The scientists found that oscillations in brain waves from the two regions appear to be intertwined. So-called sleep spindles (bursts of activity from the neocortex) were followed tens of milliseconds later by beats in the hippocampus known as ripples. The team posits that this interplay bet
4、ween the two brain regions is a key step in memory consolidation. A second study, also published online this week by the Proceedings of the National Academy of Sciences, links age-associated memory decline to high glucose levels.Previous research had shown that individuals with diabetes suffer from
5、increased memory problems. In the new work, Antonio Convit of New York University School of Medicine and his collaborators studied 30 people whose average age was 69 to investigate whether sugar levels, which tend to increase with age, affect memory in healthy people as well. The scientists administ
6、ered11 recall tests, brain scans and glucose tolerance tests, which measure how quickly sugar is absorbed from the blood by the bodys tissues. Subjects with the poorest memory recollection, the team discovered, also displayed the poorest glucose tolerance. In addition, their brain scans showed more
7、hippocampus shrinkage than those of subjects better able to absorb blood sugar.Our study suggests that this impairment12 may contribute to the memory deficits13 that occur as people age. Convit says. And it raises the intriguing possibility that improving glucose tolerance could reverse some age-ass
8、ociated problems in cognition.14 Exercise and weight control can help keep glucose levels in check15, so there may be one more reason to go to the gym.词汇：perchance p?t?:ns adv. 偶然；可能online ?nlain n. 在线的stow st?u vt. 贮藏，堆装emanate em?neit vi. 发源somatosensory ,s?um?t?sens?ri adj. 体觉的neocortex ,ni:?uk?:
9、teks n. 新（大脑）皮质oscillation ,?silei?n n. 振荡intertwine ,int?twain v. 缠绕spindle spindl n. 纺锤体ripple ripl n. 波动，脉动diabetes ,dai?bi:ti:z n. 糖尿病recollection ,rek?lek?n n. 回忆shrinkage ?ri?kid? n. 收缩impairment imp?m?nt n. 损伤intrigue intri: n. 引起。兴趣（或好奇心）cognition k?ni?n n. 认识注释：1. file memories：归档并储存记忆。 fil
10、e：意为 to put or keep (papers,etc. ) in useful order for storage or reference（把归档）。2. To sleep. Perchance to file? ：从莎士比亚笔下哈姆雷特的独白中的名句 To sleep: perchance to dream. 改编而来。3. the Proceedings: (科学文献、会议文献)汇编，常用复数形式。4. zzz：（拟声词）打鼾声 5. Rutgers University：美国新泽西州立大学 (the State University of New Jersey)。6. ema
11、nating from：发源于。7. neocortex：新(大脑)皮质，尤指大的高等哺乳动物大脑中新生长的部分，也叫做 neopallium。neo-：前縀，意思是新的。8. thehippocampus：大脑侧面脑室壁上的隆起物，也称海马状突起，在泛记过程中起主要作用。9. tens of milliseconds：几十毫秒10. age-associated memory decline：与年龄相关的记忆衰退11. administer：实施12. this impairment：指上句中 hippocampus shrinkage.13. memory deficits：记忆衰退14.
12、 the intriguing possibility that improving glucose tolerance could reverse some age-associated problems in cognition：令人兴奋的可能性，即不断改善葡萄糖容许量可以完全改变对某些与年龄相关的认知问题。15. keep glucose levels in check：限制葡萄糖水平。 in check：在控制中，被阻止。练习：1. Which of the following statements is nearest in meaning to the sentence To sl
13、eep. Perchance to file? A Does brain arrange memories in useful order during sleep?B Does brain have memories when one is sleeping?C Does brain remember files after one falls asleep?D Does brain work on files in sleep?2. What is the result of the experiment with rats and mice carried out at Rutgers
14、University?A The electrical activity is emanating from the somatosensory neocortex.B Oscillations in brain waves are from hippocampus.C Somatosensory neocortex and hippocampus work together in memory consolidation.D Somatosensory neocortex plays it primary role in memory consolidation.3. What is the
15、 relation of memory to glucose tolerance, as is indicated by a research mentioned in paragraph 4?A People with poor memory have high glucose tolerance.B People with good memory have low glucose tolerance.C Memory level has nothing to do with glucose tolerance.D The poorer the memory, the poorer glucose tolerance.4. In what way is memory related to hippocampus shrinkage?A There is no relation between memory and hippocampus shrinkage.B The more hippocampus shrinks, the poorer ones memory.C The more hippocampus shrinks, the better ones memory.D The less h
