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SSS 2008-10-13

时间:2010-05-15 02:42来源:互联网 提供网友:木渐浅。   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 Karen Hopkin. This will just take a minute.

 

We all know people who are completely unflappable, able to remain calm in the face of total calamity1. Don’t you just hate those people? Well, a new study in the October 9th issue of the journal Neuron suggests that with a little practice, you could become one of them. Because researchers led by Nobel laureate Eric Kandel have taught mice how to be less skittish—training that physically2 changes their brains.

A lot of scientists who study learning in animals make use of a kind of behavioral test that couples a sound [audio of a memorable3 sound] with a stimulus4, such as a mild foot shock. Over time, the furry5 subjects figure out that the sound signals a coming shock. Kandel’s team turned that test on its head by using a sound [audio of a memorable sound] to signal safety. Mice trained in these tests show less anxiety when they hear their safety signal.

This learned safety, the scientists found, works just as well as a drug like Prozac to keep mice calm in stressful situations, such as being tossed into a pool of water, the rodent6 equivalent of getting stuck in traffic. By studying how this training changes the brain, scientists may be able to  devise new ways to treat anxiety in people. So, next time you’re stuck in traffic, just remember, [audio of same memorable sound].

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.

 


点击收听单词发音收听单词发音  

1 calamity nsizM     
n.灾害,祸患,不幸事件
参考例句:
  • Even a greater natural calamity cannot daunt us. 再大的自然灾害也压不垮我们。
  • The attack on Pearl Harbor was a crushing calamity.偷袭珍珠港(对美军来说)是一场毁灭性的灾难。
2 physically iNix5     
adj.物质上,体格上,身体上,按自然规律
参考例句:
  • He was out of sorts physically,as well as disordered mentally.他浑身不舒服,心绪也很乱。
  • Every time I think about it I feel physically sick.一想起那件事我就感到极恶心。
3 memorable K2XyQ     
adj.值得回忆的,难忘的,特别的,显著的
参考例句:
  • This was indeed the most memorable day of my life.这的确是我一生中最值得怀念的日子。
  • The veteran soldier has fought many memorable battles.这个老兵参加过许多难忘的战斗。
4 stimulus 3huyO     
n.刺激,刺激物,促进因素,引起兴奋的事物
参考例句:
  • Regard each failure as a stimulus to further efforts.把每次失利看成对进一步努力的激励。
  • Light is a stimulus to growth in plants.光是促进植物生长的一个因素。
5 furry Rssz2D     
adj.毛皮的;似毛皮的;毛皮制的
参考例句:
  • This furry material will make a warm coat for the winter.这件毛皮料在冬天会是一件保暖的大衣。
  • Mugsy is a big furry brown dog,who wiggles when she is happy.马格斯是一只棕色大长毛狗,当她高兴得时候她会摇尾巴。
6 rodent DsNyh     
n.啮齿动物;adj.啮齿目的
参考例句:
  • When there is a full moon,this nocturnal rodent is careful to stay in its burrow.月圆之夜,这种夜间活动的啮齿类动物会小心地呆在地洞里不出来。
  • This small rodent can scoop out a long,narrow tunnel in a very short time.这种小啮齿动物能在很短的时间里挖出一条又长又窄的地道来。
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