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
44
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.
Sleep is described as ______.
选项
A、a gradual parting from the real world
B、undisturbed by tension or problems
C、drowning in an ocean of darkness
D、dependent only Upon individual age and health
答案
A
解析
因为全文通篇在描述睡眠。文章纠正了过去的旧观念,也不认为它与测到的 myoclonic jerk有多大关系,D项所谓的个体的年龄和健康状况也未见文中有述。
转载请注明原文地址:https://jikaoti.com/ti/nArFFFFM
0
大学英语六级
相关试题推荐
Intheearly20thcentury,fewthingsweremoreappealingthanthepromiseofscientificknowledge.Inaworldstrugglingwithr
Onthatbitterlycoldwinternight,fewpeoplewalkedalongthe________narrowstreet.
Herfacedoesn’t______muchovertheyears.
Abudgetoffivedollarsadayistotally_________foratriproundEurope.
Someleadershaveblamedtelevisionforthedeclineinstandardsof______.
Thenoise_________mefromconcentratingonmywriting.
Amidweakjobandhousingmarkets,consumersaresavingmoreandspendinglessthantheyhaveindecades,andindustryProfessio
A、Confident.B、Hesitant.C、Determined.D、Doubtful.B对话开始,女士问男士认为经理具体的职责是什么,男士回答说,对这种工作他知道的不多,在女士的一再要求下,男士才支支吾吾地说经理要做许多决策。由此可知,男士
SouthAfrica’seconomydisplayedsome______signsofgrowth,butworldwidesanctionswereslowinganywidespreadrecovery.
RecentlytheonlineencyclopediaWikipediacelebratedits10thbirthday.Manymediaoutlets【B1】______itsgrowth,numberofartic
随机试题
根据提问目的的不同将提问方式分为()
正弦交流电在1s内变化的电角度称为()。
某超高层建筑,室内消火栓系统采用临时高压消防给水系统,并采用减压阀减压分区供水,减压阀设置在该区域最高部位。减压阀至最不利消火栓的水头损失为0.04Mpa,其阀后静、动压设计压力值分别为0.50Mpa,0.40Mpa。下列系统调试检测结果中,不符合现行国家
加工贸易联网监管,根据实际需要办理进出口货物的备案,取代以合同为单元的备案手续。()
甲公司购买乙公司价值30万元的办公用品,向乙公司出具了一张A银行为付款人、票面金额为30万元的定日付款汇票。乙公司收到汇票后,向A银行提示承兑,A银行予以承兑。后乙公司为偿付所欠丙公司30万元货款,将该汇票背书转让给丙公司,并在背书时记载“禁止转让”字样。
A企业为有限合伙企业,经营期限为3年。A企业将全部资金用于对非关联方B公司的全资子公司C公司增资,增资完成后,A企业持有C公司60%有表决权的股份,B公司持有C公司40%有表决权的股份。根据协议规定,B公司将在3年后以固定价格回购A企业持有的C公司股份。C
进行俯卧撑练习主要发展的肌肉为()。
研究者发现细菌就像人类的简化版本,它们有自我意识,有自己的语言,群居,既交友也树敌,喜欢偷窥邻居家的隐私,还能以讹传讹,甚至杀害手足。各种细菌在自己的地盘上各司其职,相互配合,促进社会的稳定。如果以下各项为真,最能质疑上述论断的是:
甲、乙双方连续几年订有买卖“交流电机”的合同。有一次签订合同时,在“标的物”一栏只写了“电机”两字。当时正值交流电机热销,而甲方供不应求,故甲方就以直流电机交货。就民法的基本原则而言,甲方违反了()。
Clean,precisewritingorspeakingrequiressystematic,sequentialthought.Wordshavetobecrafted,notsprayed.Theyneedto
最新回复
(
0
)