首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Right and Left-handedness in Humans Why do humans, quite different from the other animal species, display a distinct left or
Right and Left-handedness in Humans Why do humans, quite different from the other animal species, display a distinct left or
admin
2010-05-26
80
问题
Right and Left-handedness in Humans
Why do humans, quite different from the other animal species, display a distinct left or right handedness? Not even our closest relatives among the apes(猿) possess such decided lateral(横向的,侧面的) asymmetry(不对称), as psychologists call it. Yet about 90 per cent of every human population that has ever lived appears to have been right-handed. Professor Bryan Turner at Deakin University has studied the research literature on left-handedness and found that handedness goes with sidedness. So nine out of ten people are right-handed and eight are right-footed. He noted that this distinctive asymmetry in the human population is itself systematic. "Humans are able to think about things in categories: black and white, up and down, left and right, It’s a system of signs that enables us to categorize phenomena that are essentially ambiguous."
The Relationship of Handedness to Gene and Inheritance
Research has shown that there is genetic or inherited(遗传的) element to bandedness. But while left-handedness tends to appear in families, neither left nor right handers will automatically produce children with the same handedness; in fact about 6 per cent of children with two right-handed parents will be left-handed. However, among two left-handed parents, perhaps 40 per cent of the children will also be left-handed. With one right and one left-handed parent, 15 to 20 per cent of the children will be left-handed. Even among identical twins who have exactly the same genes, one in six pairs will differ in their handedness.
Researchers Turned to the Brain for Reasons
while anything on the left is dangerous or even evil. We speak of left-handed advantages, and on the other hand according to Moore, "it is certain that left-handers often develop a stammer(口吃) as they are robbed of their freedom of speech." However, as more research is undertaken on the causes of left handedness, attitudes towards left-handed people are gradually changing for the better. Indeed when the champion tennis player Ivan Lend was asked what the only factor had improved his game, he said he would like to become a left-hander.
Geoff Maslen (Adapted)
The two sides of a human brain are the same before birth.
选项
A、Y
B、N
C、NG
答案
B
解析
见第五段第一句“Two American researchers, Geschwind and Galaburda, studied the brains of human and discovered that the difference between left and right asymmetry exists before birth”,人的左右大脑在出生前就已经有差别了。
转载请注明原文地址:https://kaotiyun.com/show/L6V7777K
0
大学英语四级
相关试题推荐
Oneofthethreemajorcommercialnetworks,CBSwere【M1】______organizedin1928whenitsfounderWilliamPaleya
Oneofthethreemajorcommercialnetworks,CBSwere【M1】______organizedin1928whenitsfounderWilliamPaleya
Dogsaresocialanimalsandwithoutpropertraining,theywillbehaveaswildanimals.Theywillsoilyourhouses,【M1】_
Dogsaresocialanimalsandwithoutpropertraining,theywillbehaveaswildanimals.Theywillsoilyourhouses,【M1】_
Educationistooimportanttotake【B1】______.Whenpeopletakeanythingtooseriously,theyputonblinders,whichcausethemto
Educationistooimportanttotake【B1】______.Whenpeopletakeanythingtooseriously,theyputonblinders,whichcausethemto
A、Thepersonnelmanagershouldbefiredforinefficiency.B、Afewengineersshouldbeemployedtomodernizethefactory.C、Thee
______(如果他下午来),Ishouldaskhimtohelpus.
______(我们一得出这个结论)thantheyagreedtoit.
随机试题
试以单链表为存储结构实现简单选择排序的算法。
下列不属于授权原则的是
急性梗阻性化脓性胆管炎的主要治疗原则是
建设工程项目的业主和各参与方都有进度控制的任务,各方()。
从业人员对待上门投诉的顾客所持的下列态度中,正确的是()。
在企业发展的(),实施团队薪酬的条件最有利。
1803年,美国联邦最高法院通过审理()一案,开创了由最高司法机构审查国会制定的法律是否符合宪法的先例。
Aroundtheworld,musictherapyisbeingusedtotreatdifferentmedicalconditionsandillnesses.Someofthewayspeopleusem
CreativeBookReportIdeasA)Areyouatalossforcreativebookreportideasforyourstudents?Ifyes,thenthisarticlewill
AbigtrendintheU.S.toyindustryhasmoreconsumersswitchingofftheirhigh-techgadgets(小机件)toplaywithclassictoys,li
最新回复
(
0
)