英语高级视听说下原文.docx

1、英语高级视听说下原文UNIT3 A PILL TO FORGET(CBS) If there were something you could take after experiencing a painful or traumatic event that would permanently weaken your memory of what had just happened, would you take it? As correspondent Lesley Stahl reports, its an idea that may not be so far off, and that

2、 has some critics alarmed, and some trauma victims filled with hope. I couldnt get my body to stop shaking. I was trembling, constantly trembling. Memories of it would just come back, reoccurring over and over and over, subway conductor Beatriz Arguedas recalls. Last Sept. 30, Beatriz was driving he

3、r normal route on the Red Line in Boston when one of her worst fears came to pass: Upon entering one of the busiest stations, a man jumped in front of my train, to commit suicide, she explains. Beatriz saw the man jump. We sort of made eye contact and then I felt the thud from him hitting the train

4、and then the crackling sound underneath the train and, then, of course, my heart starts thumping, she recalls. She came into our emergency room afterwards, very upset. No physical injury. Entirely a psychological trauma, says Dr. Roger Pitman, a psychiatrist at Harvard Medical School who has studied

5、 and treated patients with post-traumatic stress disorder, or PTSD, for 25 years. Theyre caught up so much with this past event that its constantly in their mind, Pitman explains. Theyre living it over and over and over as if its happening again. And they just cant get involved in real life. When Be

6、atriz arrived in the emergency room, Pitman enrolled her in an experimental study of a drug called propranolol, a medication commonly used for high blood pressure . and unofficially for stage fright. Pitman thought it might do something almost magical trick Beatrizs brain into making a weaker memory

7、 of the event she had just experienced. In the study, which is still under way, half the subjects get propranolol; half get a placebo. Asked whether he knows if Beatriz got the drug or the placebo, Dr. Pitman says he has no idea and neither does she, and that the research team wont know for another

8、two years. If Pitman is right, the results could fundamentally change the way accident victims, rape victims, even soldiers are treated after they experience trauma. The story begins with some surprising discoveries about memory. It turns out our memories are sort of like Jello they take time to sol

9、idify in our brains. And while theyre setting, its possible to make them stronger or weaker. It all depends on the stress hormone adrenaline. The man who discovered this is James McGaugh, a professor of neurobiology at the University of California, Irvine. McGaugh studies memory in rats, and he invi

10、ted Stahl to watch the making of a rat memory in this case how a rat whos never been in this tank of water before learns how to find a clear plastic platform just below the surface. Hell swim around randomly, McGaugh explains. The rat cannot see the platform, since his eyes are on the top of his hea

11、d. The rat will swim around the edge for a long time, until eventually he ventures out and by chance bumps into the platform. The next day, hell find the platform a little bit faster. But another rat, who had learned where the platform was the day prior, and then received a shot of adrenaline immedi

12、ately afterwards, today swam instantly to the platform. Adrenaline actually made this rats brain remember better, and McGaugh believes the same thing happens in people. Suppose I said to you, You know, Ive watched your programs a lot over the years, and although it pains me to have to tell you this,

13、 I think youre one of worst people Ive ever seen on now dont take it, dont take it personally, McGaugh says. So, my stress system would go into overdrive, no question, Stahl says. Even with my telling you that its not true, theres nothing to keep you from blushing, from feeling warm all over, McGaug

14、h points out. Thats the adrenaline. And I dare say that youre gonna remember my having said that long after youve forgotten the other details of our discussion here. I guarantee it. McGaugh says thats why we remember important and emotional events in our lives more than regular day-to-day experience

15、s. The next step in his research was to see what would happen when adrenaline was blocked; he started experimenting with propranolol. Propranolol sits on that nerve cell and blocks it, so that, think of this as being a key, and this is a lock, the hole in the lock is blocked because of propranolol s

16、itting there. So adrenaline can be present, but it cant do its job, McGaugh explains. McGaugh showed Stahl a third rat that had learned where the platform was on the previous day and then received an injection of propranolol. The next day, the rat swam around the edge, as if he had forgotten there e

17、ver was a platform out there. Across the country at Harvard, Roger Pitman read McGaughs studies and a light bulb went on. When I read about this, I said, This has got to be how post-traumatic stress disorder works. Because think about what happens to a person. First of all, they have a horribly trau

18、matic event, and they have intense fear and helplessness. So that intense fear and helplessness is gonna stimulate adrenaline, Pitman says. And then what do we find three months or six months or 20 years later? Excessively strong memories. Pitman figured he could block that cycle by giving trauma vi

19、ctims propranolol right away . before adrenaline could make the memories too strong. He started recruiting patients for a small pilot study. One of the first was Kathleen Logue, a paralegal who had been knocked down in the middle of a busy Boston street by a bicyclist. He just hit the whole left sid

20、e of my body. And it seemed like forever that I was laying in the middle of State Street, downtown Boston, Logue remembers. She says she was terrified that she was just going to get run over. As part of the study, Logue took propranolol four times a day for 10 days. Like the others who got the drug,

21、 three months later she showed no physiological signs of PTSD, while several subjects who got a placebo did. Those results got Pitman funding for a larger study by the National Institutes of Health. But then the Presidents Council on Bioethics condemned the study in a report that said our memories m

22、ake us who we are and that re-writing memories pharmacologically risks undermining our true identity. This is a quote. It risks making shameful acts seem less shameful or terrible acts less terrible than they really are, Stahl reads to Logue. A terrible act, she replies. Why should you have to live

23、with it every day of your life? It doesnt erase the fact that it happened. It doesnt erase your memory of it. It makes it easier to remember and function. David Magnus, director of Stanford Universitys Center for Biomedical Ethics, says he worries that it wont be just trauma victims trying to dull p

24、ainful memories. From the point of view of a pharmaceutical industry, theyre going to have every interest in having as many people as possible diagnosed with this condition and have it used as broadly as possible. Thats the reality of how drugs get introduced and utilized, Magnus argues. Hes concern

25、ed it will be used for trivial reasons. If I embarrass myself at a party Friday night and instead of feeling bad about it I could take a pill then Im going to avoid not have to avoid making a fool of myself at parties, Magnus says. So you think that that embarrassment and all of that is teaching us?

26、 Stahl asks. Absolutely, Magnus says. Our breakups, our relationships, as painful as they are, we learn from some of those painful experiences. They make us better people. But while the ethicists debate the issue, the science is moving forward. Researchers have shown in rat studies that propranolol

27、can also blunt old memories. Pitman wondered: Could it work in humans? He teamed up with Canadian colleague Alain Brunet, who searched for people with long-standing PTSD, like Rita Magil. She had suffered for three years from nightmares after a life-threatening car accident. Another study subject is

28、 Louise ODonnell-Jasmin, who was raped by a doctor at the age of 12. He raped me on his desk, on a chair, and on the floor. It, for me, it was like I was dying inside, she remembers. The world had ended. ODonnell-Jasmin was haunted by the rape for more than 30 years. She never felt comfortable undre

29、ssing in front of her husband and suffered from recurrent flashbacks and nightmares. The study was simple: Subjects came in and were asked to think about and write down every detail they could remember about their trauma; in Magils case, her car accident, reactivating the memory in her brain. She wa

30、s then given propranolol. Rita says she suffered no side effects. A week later, electrodes measured her bodys stress response as she listened to a retelling of her trauma. Asked what happened, Magil says, No reaction. And she says she had no more nightmares. The patient who made the most dramatic re

31、covery turned out to be ODonnell-Jasmin, but theres a catch, because she was in a control group and therefore wasnt supposed to improve at all. ODonnell-Jasmin was given propranolol, but unlike Magil, she took the drug while watching a pleasant movie, not after telling every detail about her rape. A

32、nd yet, a week later, she noticed a change. I wake up. And I find myself undressing. And my husband is there. And I realize Im undressing, and Im not feeling as though I need to hide under the bed anymore, she explains. Asked if it is gone, ODonnell-Jasmin says, Yes. The link, what held the emotions to the memories, its like the umbilical cord has been cut. And there is no way I can access the emotions anymore. And furthermore, every day it gets better. Louise got