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SSS 2010-01-11

时间:2010-05-20 01:32来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

When people suffer from a migraine, they often retire to a cave-like dark room. But exactly why does bright light hurt the migraine sufferer? A possible answer was published this week in the online issue of journal Nature Neuroscience. A big clue was that even some of the blind migraine victims avoid light.

 

Migraine pain is thought to come from irritation1 of the meninges, membranes2 around the brain and central nervous system. So researchers took two groups of blind migraine sufferers. One group was totally blind. The other group was legally blind but could still make out light and dark.

 

The totally blind group did not suffer from what's called photophobia. But light did aggravate3 the migraines of the legally blind group. Researchers thus suspected a group of light-sensing retinal cells that help regulate sleeping and waking, because these are the only active light receptors in the legally blind group.

 

Working with animals, the investigators4 discovered that those retinal cells send signals through the optic nerve to the brain—and to a specific group of neurons that are kicked into action during a migraine. The scientists hope the findings lead to therapies that can give migraine sufferers a brighter future.

 

—Cynthia Graber


 


点击收听单词发音收听单词发音  

1 irritation la9zf     
n.激怒,恼怒,生气
参考例句:
  • He could not hide his irritation that he had not been invited.他无法掩饰因未被邀请而生的气恼。
  • Barbicane said nothing,but his silence covered serious irritation.巴比康什么也不说,但是他的沉默里潜伏着阴郁的怒火。
2 membranes 93ec26b8b1eb155ef0aeaa845da95972     
n.(动物或植物体内的)薄膜( membrane的名词复数 );隔膜;(可起防水、防风等作用的)膜状物
参考例句:
  • The waste material is placed in cells with permeable membranes. 废液置于有渗透膜的槽中。 来自辞典例句
  • The sarcoplasmic reticulum is a system of intracellular membranes. 肌浆网属于细胞内膜系统。 来自辞典例句
3 aggravate Gxkzb     
vt.加重(剧),使恶化;激怒,使恼火
参考例句:
  • Threats will only aggravate her.恐吓只能激怒她。
  • He would only aggravate the injury by rubbing it.他揉擦伤口只会使伤势加重。
4 investigators e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
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