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
One fact was clearly demonstrated by the early sleep researchers: one part of the night is not just like another. As scientists
One fact was clearly demonstrated by the early sleep researchers: one part of the night is not just like another. As scientists
admin
2012-11-30
32
问题
One fact was clearly demonstrated by the early sleep researchers: one part of the night is not just like another. As scientists began to compare the records of volunteers during the 1950’s, they observed that human sleep follows a rhythmic schedule. They noted that not only was this schedule much the same in healthy persons of the same age with similar habits but, from night to night each individual had an EEG (电脑图) record almost as consistent as a signature.
Sleep and wadefulness, once considered to be the light and dard of consciousness, no longer seem to differ so sharply. To sleep does not mean to drown in an ocean of darkness. Actually, sleep is not a unitary (单一的) state; it involves many shades or detrees of detachment from the surrounding world. While sleep may feel like a blander of darkness punctuated by dreams-a time when the mind is asleep nothing could be less true. All night long a person drifts down and up through different levels of consciousness, as if on waves. With laboratory methods, researchers have been able to chart the typical stages of the journey into sleep.
The journey starts while the subject is still awake but beginning to relax. His brain waves, which have been low, rapid, and irregular, begin to show a new patten. This new pattern, which is known as alpha rhythm, is an even electrical pulsation (震动) of about nine to 12 cycles per second. Most people do not know what the alpha state feels like, but during the last few years researchers have been able to teach subjects how to recognize and control their alpha rhythm.
When their EEG shows an alpha rhythm, the subjects are notified, either by a sound or by the appearance of a color on a screen. Because the alpha state tends to be pleasant and relaxed, the ability to sustain it can help tense people ease their passage into sleep. A moment of tension, a loud noise, an attempt to solve a problem, however, and the alpha rhythm may vanish.
As the subject passes throuhg the gates of the unconscious, his alpha waves grow smaller, and his eyes roll very slowly. For a moment, he may wake up during this early part of the descent, alerted by a sudden spasm that causes his body to jerk. Like the brain waves, this spasm (痉挛) is a sign of neural changes within. Known as the myoclonic jerk (肌痉挛), it is caused by a brief burst of activity in the brain. Although it is related to epileptic (癫痫) seizures, the myoclonic jerk is normal in all human sleep. It is gone in a fraction of a second, after which descent continues. The subject has not felt the peculiar transformation, but now he is said to be truly aleep.
All of the following Were suggested as being used by sleep researchers EXCEPT ______.
选项
A、electrodes
B、hypnosis
C、charts
D、recorders
答案
B
解析
该题具有细节性质,但也属常识性推理。A、C、D项均是文中提及或应该用到的东西,而hypnosis(催眠状态,催眠术)却是个抽象概念,况且文中未提及。
转载请注明原文地址:https://kaotiyun.com/show/P8b7777K
0
大学英语六级
相关试题推荐
IntotheUnknownTheWorldHasNeverSeenPopulationAgeingBefore,CanItCope"!Untiltheearly1990snobodymu
WithitsentryintoWorldWarⅡ,theUnitedStatesrejectedthe______ofisolationism.
Thetwomostimportant________inmakingacakeareflourandsugar.
Overtheyears,moremoneyhasbeenputintoeducation,but______incertainareaslittlehasbeenachieved.
Herhusbandwasdisabledafteratrafficaccident,sothedirectorofboard______hertoactforherhusband.
Attemptstorestrictparkinginthecitycenterhavefurther_________theproblemoftrafficcongestion,andsometimesthetraf
Dr.Johnson______thetaskofwritingacomprehensiveEnglishdictionary.
Shewas______fromherfriendsbyherfoolishbehavior.
Theeconomystarted2006extremelystronginspiteofrecordoilpricesandrisinginterestrates.Anunusuallymildwinteracro
随机试题
设矩阵A=,则齐次线性方程组AX=0的基础解系含有解向量个数为________.
下列关于历史模拟法的说法中,错误的是()。
连锁创业可选择的形式包括百货商店、超级市场、便利店、专业店、专卖店等。关于连锁创业的业态,下列说法不正确的有()。
对于确需改变公共建筑和公用设施用途的,依法办理有关行政审批手续的是()。
邓小平同志提出,我国社会主义法制建设的要求是()。
判断级数的敛散性.
StandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtinschoolsandtonon-nat
SQL语言采用【】操作方式。例如,查询所有平均成绩在90分以上的学生姓名,用户必须说明完成该请求的具体处理过程,即如何用循环结构按照某条路径一条一条地把满足条件的学生记录读出来,而SQL语言采用集合操作方式,不仅查询结果可以是元组的集合,而且一次插入
10Base-T使用_______类型的电缆介质。
ThePersonnelDepartmenthaslostnotimeseekinga______forDr.Roberts,whorecentlyretiredafter30yearsofservice.
最新回复
(
0
)