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托福听力练习-科学美国人60秒:欧洲古人类右撇子

2017-05-07 09:11:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：欧洲古人类右撇子

　　科学美国人60秒听力练习：欧洲古人类右撇子

　　科学美国人60秒英文文本

　　When it comes to handedness, righties rule. Andaccording to a new study, they have for a long time. Because even half a million years ago, nine out of 10 European humans favored their right hands. Thefinding appears in the journal Laterality. [DavidFrayer et al., "More than 500,000 years of right-handedness in Europe"]

　　Scientists have long wondered where our handedness comes from. All other tool-using primatesshow no distinct hand preference when it comes to holding the stick or stone.

　　But have humans always been so heavily right-handed? Some scientists had previouslydetected a right-hand bias when they looked at the flaking patterns on ancient stone tools.

　　In this study, researchers turned to the teeth for answers. They analyzed the scratchesaccidentally left by stone tools on teeth from human fossils collected from a half-million-year-oldsite in northern Spain and later sites throughout Europe. These asymmetrical marks showedthat 93 percent of the individuals sampled tended to stuff things in their mouths from theright-hand side.

　　Handedness reflects our brain’s bilateral organization, which goes hand-in-hand with ourproficiency with language. So our hand preference, and our penchant for speech, mayextend deep into our evolutionary past.

　　—Karen Hopkin

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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