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SSS 2010-10-27

时间:2010-11-04 05:52来源:互联网 提供网友:ob8617   字体: [ ]
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On October 9th, we reported that cats born deaf develop enhanced vision. Now researchers find that blind people perceive touch faster than do those with sight. The work is in the Journal of Neuroscience.

Volunteers who were sighted or who had varying levels of vision loss were asked to sense the movements of a small probe tapped against the tips of their index fingers. Everyone did well distinguishing light taps from stronger taps.

But when a light tap was followed almost instantly by a big, long-lasting vibration1, those who had been blind since birth perceived each touch much better than did the sighted volunteers or those with only partial vision loss.

The researchers also varied2 the period between the tap and the vibration, and then measured the minimum separation time needed for participants to perceive the two separately. And congenitally blind people needed less time than anyone else. They were also the fastest Braille readers in the group.

The study suggests that the brain adapts to early blindness with a faster perception of touch. But the researchers admit that a lifetime of practicing Braille could also get the credit.

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

 


点击收听单词发音收听单词发音  

1 vibration nLDza     
n.颤动,振动;摆动
参考例句:
  • There is so much vibration on a ship that one cannot write.船上的震动大得使人无法书写。
  • The vibration of the window woke me up.窗子的震动把我惊醒了。
2 varied giIw9     
adj.多样的,多变化的
参考例句:
  • The forms of art are many and varied.艺术的形式是多种多样的。
  • The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。
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