IT’S DIFFICULT TO IMAGINE MANY THINGS that peoplewould welcome more than a memory-enhancing drug. ____1____ Furthermore, such adrug could help people remember past experiences more clearly and help usacquire new information more easily for school and at work. As scientists learnmore about memory, we are closing in on this tantalizing goal.1

　　Some of the most exciting evidence comes fromresearch that has built on earlier findings linking LTP2 and memoryto identify a gene that improves memory in mice. ____2____ Mice bred to haveextra copies of this gene showed more activity in their NMDA receptors，more LTP，and improved performance on severaldifferent memory tasks — learning a spatial layout3, recognizingfamiliar objects，and recallinga fear-inducing shock.

　　If these basic insights about genes, LTP, and thesynaptic basis of memory can be translated to people — and that remains to beseen — they could pave the way for memory-enhancing treatments. ____3____ Asexciting as this may sound, it also raises troubling issues. Consider thepotential educational implications of memory-enhancing drugs. If memoryenhancers were available, children who used them might be able to acquire andretain extraordinary amounts of information, allowing them to progress far morerapidly in school than they could otherwise. How well could the brain handlesuch an onslaught of information? What happens to children who don’t haveaccess to the latest memory enhancers? Are they left behind in school — and asa result handicapped later in life?

　　____4____ Imagine that you are applying for a jobthat requires a good memory，such as a manager at a technology company or a sales position thatrequires remembering customers’ names as well as the attributes of differentproducts and services. Would you take a memory-enhancing drug to increase yourchances of landing the position? Would people who felt uncomfortable takingsuch a drug find themselves cut out of lucrative career opportunities?

　　Memory drugs might also help take the sting out ofdisturbing memories that we wish we could forget but can’t.4 The2004 hit movie Eternal Sunshine of the Spotless Mind told the story of a youngman seeking just such freedom from the painful memories of a romantic breakup.As you will see in the section on persistence later in the chapter, emotionallyarousing events often create intrusive memories, and researchers have alreadymuted emotional memories with drugs that block the action of key hormones.Should emergency workers who must confront horrifying accident scenes that canburden them with persisting memories be provided with such drugs? Should suchdrugs be given to rape victims who can’t forget the trauma? Memory drugs mightprovide some relief to such individuals. But could they also interfere with anindividual’s ability to assimilate and come to terms with a difficultexperience?5 ____5____

　　词汇：

　　tantalizing/ ?tænt?la?z?? / adj.诱人的

　　synaptic/ s??næpt?k / adj.(解剖学)突触的

　　steroid/ ?st??r??d / n.类固醇

　　onslaught/ ??nsl?:t / n.大量

　　lucrative/ ?lu:kr?t?v / adj.有利可图的

　　hit/hit / n.(演出等)成功

　　注释：

　　1.As scientists learn more aboutmemory, we are closing in on this tantalizing goal.随着科学家们对记忆了解增多，我们正接近这一诱人的目标。

　　2.LTP&SNMDA：(Long-term Potentiation)给突触前纤维一个短暂的髙频剌激后，突触传递效率和强度增加几倍且能持续数小时至几天保持这种增强的现象。LTP发现海马LTP可能是学习记忆的分子基础。1973年Bliss及其合作者，电刺激麻醉兔的内嗅皮层，使海马表层的穿通纤维兴奋，可在齿状回记录到场电位。先用高频电刺激几秒钟后，再用单个电刺激，记录到的部分场电位幅度大大超过原先记录的对照值，并可持续几小时，几天。这一现象称为长时程增强效应(LTP)。1983年发现NMDA(N—甲基一D—门冬氨酸)受体通道复合体在LTP过程中起重要作用，进一步深化了对LTP在大脑学习记忆中作用的理解。

　　3.a spatial layout：空间布局

　　4.Memory drugs might also help takethe sting out of disturbing memories that we wish we could forget but can’t：增强记忆药对我们想忘记却又不能的令人烦扰的记忆变得令人易于接受。take the sting out of：使……易于被接受;使 ……令人感到愉快

　　5.But could they also interfere withan individual’s ability to assimilate and come to terms with a difficultexperience? 中的come toterms with：让步;屈服

　　练习：

　　A　Like steroids for bulking up the muscles, these drugs would bulk upmemory.

　　B　A memory enhancer could help eliminate forgetting associated withaging and disease.

　　C　What are the potential implications of memory-enhancing drugs forthe workplace?

　　D　We may find ourselves struggling with these kinds of questions inthe not-too-distant future.

　　E　There is a pill that you could take every day to allow you toremember everything.

　　F　The gene makes a protein that assists the NMDA2 receptor，which plays an important role inlong-term memory by helping to initiate LTP.

　　答案与题解：

　　1.B依据上一句的“很难想象一种提高人们记忆力的药会受到人们吹捧”;下面应该对这一现象做出解释，即这种药物有什么疗效;而后一句的Furthermore这一指示词起到了递进的作用，进一步说明这种药物的益处。More than ：非常，极其，十分

　　2.F前一句的关键词是gene、LTP和mice，它讲的是有些令人兴奋的证据是从研究中得出的;该研究基于早期连接LTP和记忆的发现，该结果确定了提髙老鼠记忆的基因;而后一句进一步阐述这一发现，开头的mice可以是一个连接词。

　　3.A前一句讲：如果这种结果用于人类的话，人们就有可能把提高人的记忆力用于临床。这一句讲：就像类固醇用于提髙人的肌肉能力，这种药物也可以提高人的记忆力。

　　4.C一般情况下，每一段的第一句都是本段的主题句。而该句是一个问句：这种提高记忆力的药物用于职场有什么潜在的启示呢?紧接着本段其余几句都提出关于这种药物是否会对职场的提升有什么影响的问题。

　　5.D本句是全文的最后一句。应该是总结性的。鉴于前面都列举了这种提高记忆力的药所面临的一系列问题，所以，我们在不久的将来要面临这些问题。