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
Left-handers have been the subject of curiosity, stigma and even fear over the centuries. Researchers now, however, are recogniz
Left-handers have been the subject of curiosity, stigma and even fear over the centuries. Researchers now, however, are recogniz
admin
2014-09-30
44
问题
Left-handers have been the subject of curiosity, stigma and even fear over the centuries. Researchers now, however, are recognizing the scientific importance of understanding why people use one hand or the other to write, eat or toss a ball.
Handedness, as the dominance of one hand over the other is called, provides a window into the way our brains are wired, experts say. And it may help shed light on disorders related to brain development, like dyslexia(诵读困难症), schizophrenia(精神分裂症)and attention deficit hyperactivity disorder, or ADHD(注意力缺陷多动障碍), which are more common in left-handed people.
Other recent research suggests that mixed-handedness—using different hands for daily tasks and not having a dominant one—may be even more strongly linked than left-handedness to ADHD and possibly other conditions.
About 10% of people are left-handed, according to expert estimates. Another 1% of the population is mixed-handed. What causes people not to favor their right hand is only partly due to genetics—even identical twins, who have 100% of the same genes, don’t always share handedness.
More important, researchers say, are environmental factors—especially stress—in the womb. Babies born to older mothers or at a lower birth weight are more likely to be lefties, for example. And mothers who were exposed to unusually high levels of stress during pregnancy are more likely to give birth to a left-handed child. A review of research, published in 2009 in the journal Neuropsychologia, estimated that about 25% of the variability in handedness is due to genetics.
On average there is no significant difference in IQ between righties and lefties, studies show, betraying popular perceptions. There is some evidence that lefties are better at divergent thinking, or starting from existing knowledge to develop new concepts, which is considered an element of creativity. And left-handed people have salaries that on average are about 10% lower than righties, according to recent research performed at Harvard University that analyzed large income data bases, although findings of some earlier studies were mixed.
Left-handedness appears to be associated with a greater risk for a number of psychiatric and developmental disorders. While lefties make up about 10% of the overall population, about 20% of people with schizophrenia are lefties, for example. Links between left-handedness and dyslexia, ADHD and some mood disorders have also been reported in research studies.
The reasons for this aren’t clear. Scientists speculate it could be related to a concept known as brain lateralization. The brain has two halves. Each performs primarily separate, specialized functions, such as language processing, which mainly takes place in the left hemisphere. There is lots of communication between the hemispheres.
What is the most possible reason for left-handedness?
选项
A、The living environment of left-handers is highly stressful.
B、Left-handedness is more likely to be affected by genetics.
C、Mothers might be under high stress when they were in pregnancy.
D、Mothers might lose weight when they gave birth.
答案
C
解析
细节推断题。第四段第三句中的causes和due to表明本句的内容是有关偏手性的原因,基因是造成偏手性的部分原因。第五段第一句紧接着指出了更重要的原因(More important…factors)与子宫环境有关:年龄较大的母亲生的婴儿或者出生时体重较轻的婴儿更容易是左撇子;母亲在怀孕时承受不同寻常的高强度压力,更容易生出左撇子的孩子。综合判断选项,造成左撇子可能的原因之一是C)“母亲在怀孕时遭受高强度的压力”。A)“左撇子的生活环境压力大”曲解原文中的“environmental factors…in the womb”(子宫环境),故排除;虽说遗传是导致偏手性的部分原因,但不能由此而推断B)“左撇子受遗传的影响更大”,故排除;D)“母亲生产时体重可能减轻了”在文中找不到依据,故排除。
转载请注明原文地址:https://jikaoti.com/ti/pmgFFFFM
0
大学英语六级
相关试题推荐
AstheworldexcitedlygreetedSnuppy,thefirstcloned(克隆)dog,commentatorscelebratedourcleverness.Manyfeelproudthatour
TheInternetandcellphonesarebringingpeopletogether,not【C1】______usapart—atleast,accordingtoanewsurveyrecentlyby
Somethingveryunusualhappenedabout80,000yearsago,asEarth’slasticeagewasgettingstarted.Sealevelsthathadbeendr
Somepeople’searsproducewaxlikebusylittlebees.Thiscanbeaproblemeventhoughearwax(耳垢)appearstoserveanimportant
A、Thereisnorush.B、Thewinnerbecomestheking.C、Friendshipfirst,competitionsecond.D、Fasterandstronger.A男士说,关键是不要拥挤,这
A、Heisagoodfather.B、Hehasnochild.C、Helikeschildrenverymuch.D、Heunderstandschildren.B女士问男士怎样才算好父亲。男士说他并未亲身经历,可知
Therearebasicallythreetypesofrelationshipsbetweenhumanityandnature:masteryovernature(manisto【B1】______nature),h
Therearebasicallythreetypesofrelationshipsbetweenhumanityandnature:masteryovernature(manisto【B1】______nature),h
A、It’seasierforparentstoknowtheirbabies’needs.B、It’seasierforbabiestolearntheirmothertongue.C、Itcanimprove
Populationgrowthwillmeanover100millionmorepeopleintheUnitedStatesoverthenextfourdecadeswhowillneedenergyan
随机试题
58岁,男,车祸伤3小时后送来急诊,检查发现骨盆骨折,左股骨干骨折、左胫腓骨骨折,体查:面色苍白,血压75/45mmHg
患者女,15岁。恒猞,磨牙中性关系,上、下牙弓Ⅱ度拥挤,口腔卫生差,牙石++,低角,深覆颌Ⅱ度,深覆盖Ⅱ度。此病例矫治成功的关键是
李某因犯盗窃罪被判处有期徒刑8年,执行5年后被假释,被假释2年后,李某又犯放火罪,应判处有期徒刑10年,对李某应在以下哪一幅度内决定应执行的刑罚?
注册咨询工程师(投资)的重新申请初始注册的申请人是()。
(一)建立账套1.账套信息账套号:607账套名称:中国××集团账套路径:默认账套启用日期:2008年1月单位名称(简称):中国××企业类型:工业行业性质:小企业会计制度账套主管:王峰按行业性质预置科目基础信息:客户
试论述教育心理学各流派关于学习迁移的理论观点。
根据我国宪法的规定,下列有关公民基本权利的宪法保护的表述,正确的是()
自清代顾炎武提出“以经学为理学”这一口号之后,“理学空疏”就成了清代学者的共识。但顾炎武的论调还比较_________.对朱熹也保持了适度的尊敬。在清代反对朱熹最为激烈的当数博野颜元,他甚至_________朱熹理学是“禅学”,并将帖括(科举)、禅宗、“宋
Mammalsvaryenormouslyinsize,fromweighinglessthanapennytomeasuringmorethanthreeschoolbusesinlength.Somegroup
请写出图书馆藏书管理系统的E-R模型图,该系统涉及的实体集及属性。根据E-R图中给出的词汇,按照“关系模式名(属性,属性,…)”的格式,将此E-R图转换为7个关系模式,其中模式名根据需要取实体名或联系名。
最新回复
(
0
)