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SSS 2008-11-11

时间:2010-05-15 06:10来源:互联网 提供网友:木渐浅。   字体: [ ]
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This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute?

 

If you're too tired to think straight, it might be because parts of your brain are already asleep at the wheel. A team of neuroscientists from Washington State University is challenging the belief that a specific region of the brain makes the call to hit the sack. Instead, our brains power down in stages, the researchers say. If a certain group of cells in our brain gets fatigued1, it simply shuts off. Surrounding areas respond in kind and also begin to doze2. Once a critical mass of gray matter reaches this point, our brain calls it a day. The research will appear in the December issue of the journal Nature Reviews Neuroscience.

According to the paper, a centralized sleep command center can't account for behaviors like sleepwalking and "sleep inertia," or the sluggishness3 we feel when we first wake up. In those cases, parts of our brain are obviously awake while others are fast asleep. All this suggests that regions of our brain can make their own decisions about wakefulness. So next time your partner wants to talk at bedtime and asks "Are you asleep?" don't worry about saying yes. Truth is, part of your brain is probably already snoring.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Adam Hinterthuer.

 


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1 fatigued fatigued     
adj. 疲乏的
参考例句:
  • The exercises fatigued her. 操练使她感到很疲乏。
  • The President smiled, with fatigued tolerance for a minor person's naivety. 总统笑了笑,疲惫地表现出对一个下级人员的天真想法的宽容。
2 doze IsoxV     
v.打瞌睡;n.打盹,假寐
参考例句:
  • He likes to have a doze after lunch.他喜欢午饭后打个盹。
  • While the adults doze,the young play.大人们在打瞌睡,而孩子们在玩耍。
3 sluggishness e31ba04ce731e8a18e32686e456458a2     
不振,萧条,呆滞;惰性;滞性;惯性
参考例句:
  • Such estimate of viscosities do give us some concept of the sluggishness of debris flows. 这种对泥石流粘度的估计确实给我们提供了一些泥石流惰性方面的概念。 来自辞典例句
  • The general appearance of sluggishness alarmed his friends. 那种呆滞的样子吓坏了他的朋友们。 来自互联网
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