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SSS 2008-02-06

时间：2010-05-13 02:24:48

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（单词翻译）

This is Scientific Americans' 60-second Science. I'm Karen Hopkin. This will just take a minute.

When you have an itch1 nothing feels better than a good scratch. Now scientists from Wake Forest University Baptist Medical Center think they know why. The scientists were wondering why raking fingernails across skin brings us such pleasure. So they looked to the brain. More precisely2 they looked in the brain. Using advanced imaging techniques the scientists looked to see which parts of the brain are most active when people scratch or in this case, when people are scratched by a guy in a white lab coat with a special scratching brush. What they found is scratching does not activate3 areas of the brain normally associated with pleasure, although it did boost the activity of the prefrontal cortex which can be involved in compulsive behavior. That makes sense. But the major effect of scratching was to decrease the activity of brain regions associated with unpleasant sensory4 experiences. So scratching seems to relieve the unpleasant feelings that accompany, well, itching5. Yes in a landmark6 study that appears in the Journal of Investigative Dermatology scratching gets rid of the itch. Me I'm holding out for the study that shows that people bang their heads against the wall because it feels so good when you stop.
 


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1 itch 9aczc     
n.痒，渴望，疥癣；vi.发痒，渴望
参考例句：
  • Shylock has an itch for money.夏洛克渴望发财。
  • He had an itch on his back.他背部发痒。
2 precisely zlWzUb     
adv.恰好，正好，精确地，细致地
参考例句：
  • It's precisely that sort of slick sales-talk that I mistrust.我不相信的正是那种油腔滑调的推销宣传。
  • The man adjusted very precisely.那个人调得很准。
3 activate UJ2y0     
vt.使活动起来，使开始起作用
参考例句：
  • We must activate the youth to study.我们要激励青年去学习。
  • These push buttons can activate the elevator.这些按钮能启动电梯。
4 sensory Azlwe     
adj.知觉的，感觉的，知觉器官的
参考例句：
  • Human powers of sensory discrimination are limited.人类感官分辨能力有限。
  • The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。
5 itching wqnzVZ     
adj.贪得的，痒的，渴望的v.发痒( itch的现在分词 )
参考例句：
  • The itching was almost more than he could stand. 他痒得几乎忍不住了。 来自《现代汉英综合大词典》
  • My nose is itching. 我的鼻子发痒。 来自《简明英汉词典》
6 landmark j2DxG     
n.陆标，划时代的事，地界标
参考例句：
  • The Russian Revolution represents a landmark in world history.俄国革命是世界历史上的一个里程碑。
  • The tower was once a landmark for ships.这座塔曾是船只的陆标。

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