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SSS 2010-10-11

时间:2010-11-04 05:16来源:互联网 提供网友:ob8617   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American’s 60-Second Science. I’m Christie Nicholson. Got a minute?

Is it an old wives tale or can deaf people actually see better? Scientists have long thought that the structure of our brain is fixed1. For instance, from birth the auditory cortex will receive only sound or the visual cortex will receive only visual input2.

But in the last decade neuroscientists have overthrown3 this idea in favor of a more malleable4 brain. 

New research published this week in the journal Nature Neuroscience supports that view. It helps explain why those who are congenitally deaf may have extraordinary sight.

Since the auditory cortex sits there, at birth, waiting for auditory inputs5 that never come, it actually starts receiving visual stimuli6 instead—in cats anyway. And the neural7 real estate devoted8 to vision increases.

Researchers compared congenitally deaf cats to hearing cats, and found that deaf cats have enhanced peripheral9 vision and motion detection.

And they confirmed that the part of the auditory cortex that picks up peripheral sound switches to peripheral vision.  

With the deaf it’s especially good to have increased peripheral vision. If you cannot hear a car approaching from the side, it'd be advantageous10 to actually see it.

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Christie Nicholson.
 


点击收听单词发音收听单词发音  

1 fixed JsKzzj     
adj.固定的,不变的,准备好的;(计算机)固定的
参考例句:
  • Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗?
  • Once the aim is fixed,we should not change it arbitrarily.目标一旦确定,我们就不应该随意改变。
2 input X6lxm     
n.输入(物);投入;vt.把(数据等)输入计算机
参考例句:
  • I will forever be grateful for his considerable input.我将永远感激他的大量投入。
  • All this information had to be input onto the computer.所有这些信息都必须输入计算机。
3 overthrown 1e19c245f384e53a42f4faa000742c18     
adj. 打翻的,推倒的,倾覆的 动词overthrow的过去分词
参考例句:
  • The president was overthrown in a military coup. 总统在军事政变中被赶下台。
  • He has overthrown the basic standards of morality. 他已摒弃了基本的道德标准。
4 malleable Qwdyo     
adj.(金属)可锻的;有延展性的;(性格)可训练的
参考例句:
  • Silver is the most malleable of all metals.银是延展性最好的金属。
  • Scientists are finding that the adult human brain is far more malleable than they once thought.科学家发现成人大脑的可塑性远超过他们之前认识到的。
5 inputs a8aff967e1649a1c82ea607c881e8091     
n.输入( input的名词复数 );投入;输入端;输入的数据v.把…输入电脑( input的第三人称单数 )
参考例句:
  • Uncheck the inputs checked for optimization in the previous stage. 不测试那些已经测试过的优化了的以前步骤的inputs.(变量参数)。 来自互联网
  • Just in case, save in a file the inputs obtained at the previous stage. 以防万一,保存以前步骤获得的inputs(变量参数值)到一个文件中去。 来自互联网
6 stimuli luBwM     
n.刺激(物)
参考例句:
  • It is necessary to curtail or alter normally coexisting stimuli.必需消除或改变正常时并存的刺激。
  • My sweat glands also respond to emotional stimuli.我的汗腺对情绪刺激也能产生反应。
7 neural DnXzFt     
adj.神经的,神经系统的
参考例句:
  • The neural network can preferably solve the non- linear problem.利用神经网络建模可以较好地解决非线性问题。
  • The information transmission in neural system depends on neurotransmitters.信息传递的神经途径有赖于神经递质。
8 devoted xu9zka     
adj.忠诚的,忠实的,热心的,献身于...的
参考例句:
  • He devoted his life to the educational cause of the motherland.他为祖国的教育事业贡献了一生。
  • We devoted a lengthy and full discussion to this topic.我们对这个题目进行了长时间的充分讨论。
9 peripheral t3Oz5     
adj.周边的,外围的
参考例句:
  • We dealt with the peripheral aspects of a cost reduction program.我们谈到了降低成本计划的一些外围问题。
  • The hotel provides the clerk the service and the peripheral traveling consultation.旅舍提供票务服务和周边旅游咨询。
10 advantageous BK5yp     
adj.有利的;有帮助的
参考例句:
  • Injections of vitamin C are obviously advantageous.注射维生素C显然是有利的。
  • You're in a very advantageous position.你处于非常有利的地位。
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