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
医学
The brain is organized into different regions, each responsible for different functions, and in humans this organization is very
The brain is organized into different regions, each responsible for different functions, and in humans this organization is very
admin
2013-12-06
32
问题
The brain is organized into different regions, each responsible for different functions, and in humans this organization is very marked. The largest parts of the brain are the cerebral hemispheres, which occupy most of the interior of the skull. They are layered structures, the most complex being the outer layer, known as the cerebral cortex, where the nerve cells are extremely densely packed to allow great interconnectivity. Its function is not fully understood, but we can get some indication of its purpose from studies of animals that have had it removed. A dog, for example, can still move in a coordinated manner, will eat and sleep, and even bark if it is disturbed. However, it also becomes blind and loses its sense of smell-more significantly, perhaps, it loses all interest in its environment, not responding to people or to its name, nor to other dogs, even of the opposite sex. It also loses all ability to learn. In effect, it loses the characteristics that we generally refer to as indicating intelligence-awareness, interest and interaction with an environment, and an ability to adapt and learn. Thus the cerebral cortex seems to be the seat of the higher order functions of the brain, and the core of intelligence.
The cerebral cortex has been the subject of investigation by researchers for many years, and is slowly revealing its secrets. It demonstrates a localization of functions, in that different areas of the cortex fulfill different functions, such as motion control, hearing, and vision. The visual part of the cortex is especially interesting. In the visual cortex, electrical stimulation of the cells can produce the sensation of light, and detailed analysis has shown that specific layers of neurons are sensitive to particular orientations of input stimuli, so that one layer responds maximally to horizontal lines, while another responds to vertical ones. Although much of this structure is genetically pre-determined, the orientation-specific layout of the cells appears to be learnt at an early stage. Animals brought up in an environment of purely horizontal lines do not develop neuron structures that respond to vertical orientations, showing that these structures are developed due to environmental input and not purely from genetic pre-determination. This is called self-organization of the visual cortex since there is no external teacher to guide the development of these structures.
The visual part of the cortex is especially interesting because______.
选项
A、specific layers of neurons are sensitive to particular orientations of input stimuli.
B、much of the structure is genetically pre-determined
C、horizontal lines are stimulated
D、vertical lines are stimulated
答案
A
解析
依据文章第二段中“The visual part of the cortex is especially interesting….and detailedanalysis has shown that specific layers of neurous are sensitive to particular orientations ofinput stimuli….”可确定A为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/S5U3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
Ihadneverbeeninthepublicwardofahospitalbefore,anditwasmyfirstexperienceofdoctorswhohandleyouwithoutspeak
Thepopularideathatclassicalmusiccanimproveyourmathsisfallingfromfavor.Newexperimentshavefailedtosupportthew
A、Shewasknockeddownbyafeather.B、SheisshamedofLarry.C、Shewasreallysurprised.D、ShewasproudofLarry.C女士听到消息后说的话
A、Whenhisstoolbecomeslooseandwatery.B、Whenhisdiarrheabecomesinconvenientlyfrequentandwatery.C、Whenhislipsandm
Henevergavemuchthoughttotheadditionalkilogramshehad______lately.
Everyonehasseenithappen.Acolleaguewhohasbeenexcited,involved,andproductiveslowlybeginstopullback,loseenergy
Allinstrumentsthatcomeintocontactwiththepatientmustbe______beforebeingusedbyothers.
A、Thecommercialcompanieshaveinvestedalotinthenewmachine.B、Thefurtherdevelopmentofthemachineisinfinancialtrou
A、Gotobedearlier.B、Gotothegymlessoften.C、Gotothegymlaterintheday.D、Gotothegymwithafriend.B由“butwhosay
Becauseheworeastrangecollectionofclothesandoftentalkedtohimself,hisneighborconsideredhimeccentric.
随机试题
给定材料材料1“2013年9月至2014年1月,C市某村原党支部书记刘万全、原村委会主任马厚章、原村文书严志勇,为承建商在该村实施扶贫开发相关工程项目过程中提供方便,收受承建商好处费。2017年5月26日,刘万全、马厚章、严志勇等3人受
在亚溯发展中国家中,平均每千人拥有电视机最多的是________。
简述内含报酬率的含义及其优点。
下列居住区指标不属于必要指标的是()。
业主方项目进度控制的任务是控制()的进度。
生产某产品的工人小组由4人组成,在正常施工条件下,其完成单位合格产品所必须的工作时间为4小时,则生产该产品的劳动定额为( )工日。
下列犯罪中,主观方面可以由过失构成的有______。
外部效应是指在实际经济活动中,生产者或消费者的活动为其他生产者或消费者带来的非市场性影响。通常指厂商或个人在正常交易以外为其他厂商或个人提供的便利或施加的成本。根据上述定义,下列选项体现外部效应的是()。
Withthedevelopmentofscienceandtechnology,weknowmuchofglaciers.Foralltheirgreatdiversityofshapesandsizes,gla
PeoplewhospendalotoftimesurfingtheInternetaremorelikelytoshowsignsofdepression,BritishscientistssaidonWedn
最新回复
(
0
)