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
As infants, we live without a sense of the past; as adults, we can recall events from decades ago. Scientists have only a vague
As infants, we live without a sense of the past; as adults, we can recall events from decades ago. Scientists have only a vague
admin
2013-06-03
37
问题
As infants, we live without a sense of the past; as adults, we can recall events from decades ago. Scientists have only a vague understanding of this remarkable transition, when our sense of time expands beyond this morning’s feeding and last week’s bath, but now they know a bit more: Conor Liston of Harvard University has determined that the beginnings of long-term recall arise between the ninth and the 17th month of a baby’s life, coinciding with structural changes in the memory- processing regions of the brain. Besides explaining why Junior doesn’t remember last month’s trip to Disney World, these results should help guide future research on the link between early behavioral development and changes in the infant brain.
"It wasn’t clear how long children in the first year of life could retain a memory of an event," Liston says. We were interested in testing the hypothesis that neurological developments at the end of the first year and the beginning of the second would result in a significant Enhancement in this kind of memory.
Liston showed a simple demonstration to infants ages 9, 17, or 24 months old. The test results showed a huge difference between the test children Who had been 9 months old when they saw the first demonstration and those who had been older. "Whereas 9-month-olds don’t I really remember a thing after four months, 17-and 24-month-olds do," Liston says. "Something is happening in the brain between 9 and 17 months old that enables children to encode these memories efficiently and in such a way that they can be retained and retrieved after a long period of time," Liston says. Researchers believe that changes in certain regions of the brain’s frontal lobe and the hippocampus, which axe associated with memory retention and retrieval, drive the rapid expansion of childhood recall. Previous studies have shown that the frontal lobes in humans begin to mature during the last quarter of the first year of life.
Liston’s work may help explain why adults can rarely remember anything from before their second birthday or so. Most people simply accept this "infant amnesia" as a fact of life. "But it’s not clear why a 40-year-old has plenty of memories for something that happened 20 years ago, but a 20- year-old has basically no memories for something that happened when he was 2 or 3 ," Liston says. He suggests that the same brain mechanisms that were not yet able to encode long-term memories in 9-month-olds may also play some role in adults’ inability to remember events of infancy. Researchers still need to look at other areas of cognition -- such as what role language ability plays in memory -- to really fully understand why people can’ t remember anything that happened before 2--3 years of age. But one thing is clear: When l-year-old Snookums claims he doesn’t remember breaking the heirloom chitin five months ago, he’s almost surely telling the truth.
Conor Liston ______.
选项
A、has only a vague understanding of infants’ poor memory
B、has found something more about the origin of long-term recall
C、has detected the regions of the brain responsible for memory-processing
D、has established a theory about memory development
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/noM7777K
0
大学英语四级
相关试题推荐
BornonJuly31,1965,inGloucestershire,England,JoanneKathleenRowlinggrewupinruralcommunitiesinthesouthwesternpar
LearningalanguageWhenDoWeLearnaLanguage?Childrenbeginlearninglanguagesatbirth(infantspayattentiontotheir
A、Thedoorman.B、OneoftheBeatles.C、A20-year-oldyoungman.D、AfanoftheBeatlesandJohnLennon.D此题从选项中可推断问题可能与人的身份有关。首
A、InDakota.B、InHawaii.C、InNewYork.D、InEngland.C此题与地点有关,在听短文时应留意相关的句子。四个选项分别出现在以下的几个句子中:"outsidehishomeinDakotaApar
Memoryisourmostimportantpossession.Withoutmemory,youwouldn’tknowwhoyouare.Youcouldn’tthinkaboutthepastorpla
Nodocumentisallowedtobe______topublicbyanypartywithoutthewrittenconsentofotherparty.
A、Europeantradition.B、Weightsandmeasurements.C、Employment.D、USpoliticalsystem.B
Ifthejobofdecoratingyourroom--notonlywithfurniturebutwithfloorandwallcoverings,artworkandotherelements--s
Themodernageisanageofelectricity.Peoplearesousedtoelectriclights,radio,televisions,andtelephonesthatitisha
A、Usetheformalmannerofaddress.B、Usetheinformalmannerofaddress.C、Addresspeoplebytheirfirstnames.D、Addresspeopl
随机试题
城市和农村按居民居住地区设立的居民委员会或者村民委员会是基层群众自治组织。有关基层群众自治组织,下列说法中错误的是:()
学校教育、家庭教育和社会教育的关系是什么?
男性,65岁,2周来不明原因发热,乏力,多汗,食欲不振,检查心界不大,胸骨左缘第三肋间可闻舒张期叹气样杂音,心率100次/分,律整,肺清,肝未及,脾侧位触及,血压20.8/9.1kPa(146/70mmHg)
已知某药物的水解既受酸催化,又受碱催化,其pH-速度图形是
工程项目总控的特点有()。
填写票据金额时,“人民币67009.12元”应写成( )。
某一年期零息债券的年收益率为17.8%,假设由于债权人违约后的债权回收率为20%,若一年期无风险年收益率为5%,则根据风险中性定价模型得到上述债权在一年内的违约概率为()。
在我国,公安工作是由人民警察以()名义按国家法律赋予的职权进行社会行政管理执行国家意志,维护工人阶级和广大人民群众利益的活动。
设三维向量.已知向量组α1,α2,α3与β1,β2,β3是等价的.求a,b,c.
PLAYINGCHESS0InyourlastletteryouaskedmetotellyouwhyIlikeplaying00chesssomuch.Well,Ineverthelessth
最新回复
(
0
)