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SSS 2008-01-18

时间:2010-05-13 00:58来源:互联网 提供网友:Suki12322   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific Americans' 60-Second Science. I'm Steve Mirsky. Got a minute?

Gonna watch the NFL Conference Championship games on Sunday? You’ll see evidence for a new finding: aggression1 is rewarding. In what scientists from Vanderbilt University say is the first study of its kind. They report that aggressive behavior triggers dopamine, a neurotransmitter in the brain, that is known to be part of a reward system. Dopamine levels increase, when people and animals get food, sex and drugs like cocaine2. The researchers report in the online edition of the journal Psychopharmacology that when a caged male mouse was faced with an intrusive3 male mouse that replaced the female previously4 in the cage, the first male got aggressive. He bit and boxed the interloper. But when the intruder was removed, the mouse would engage in behavior that he learned would bring his target back. The researchers think that aggression was its own reward. More evidence, when the mouse that was deprived of his female companion got a drug that inactivated5 dopamine receptors, he brought the intruder back less frequently. So remember that when Michael Strahan is smashing into Brett Farve, he really, really likes it.

Thanks for the minute for Scientific Americans' 60-Second Scinence. I'm Steve Mirsky.


点击收听单词发音收听单词发音  

1 aggression WKjyF     
n.进攻,侵略,侵犯,侵害
参考例句:
  • So long as we are firmly united, we need fear no aggression.只要我们紧密地团结,就不必惧怕外来侵略。
  • Her view is that aggression is part of human nature.她认为攻击性是人类本性的一部份。
2 cocaine VbYy4     
n.可卡因,古柯碱(用作局部麻醉剂)
参考例句:
  • That young man is a cocaine addict.那个年轻人吸食可卡因成瘾。
  • Don't have cocaine abusively.不可滥服古柯碱。
3 intrusive Palzu     
adj.打搅的;侵扰的
参考例句:
  • The cameras were not an intrusive presence.那些摄像机的存在并不令人反感。
  • Staffs are courteous but never intrusive.员工谦恭有礼却从不让人感到唐突。
4 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
5 inactivated 9301af139e2f8eb6dae70f855b1f1216     
v.使不活泼,阻止活动( inactivate的过去式和过去分词 )
参考例句:
  • Molluscicides are quickly inactivated by sunlight and adsorption to mud organic matter. 灭螺剂因阳光作用、泥土及有机物质的吸收会很快失效。 来自辞典例句
  • Viruses were inactivated by BPL and the toxicity measured again. BPL对病毒进行灭活,测定残存毒力。 来自互联网
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