首页
登录
职称英语
One fact was clearly demonstrated by the early sleep researchers: one part o
One fact was clearly demonstrated by the early sleep researchers: one part o
游客
2024-05-15
51
管理
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. [br] The term "subjects" (line 7, para. 3) refers to ______.
选项
A、waves
B、dreams
C、volunteers
D、instruments
答案
C
解析
该词在本文提到四、五次之多,意为“实验对象”,选择C项是因为本文的“实验对象”是些volunteers。
转载请注明原文地址:https://tihaiku.com/zcyy/3599344.html
相关试题推荐
Onefactwasclearlydemonstratedbytheearlysleepresearchers:oneparto
Onefactwasclearlydemonstratedbytheearlysleepresearchers:oneparto
Onefactwasclearlydemonstratedbytheearlysleepresearchers:oneparto
Researchersareincreasinglyinterestedinmanipulatingtheenvironmentearl
Researchersareincreasinglyinterestedinmanipulatingtheenvironmentearl
Researchersareincreasinglyinterestedinmanipulatingtheenvironmentearl
[originaltext]Climateresearchersstilldonotagreeonwhethertheearth
[originaltext]Climateresearchersstilldonotagreeonwhethertheearth
Twogroupsofscientistsdemonstratedlastweekfoxthefirsttimethatthe
Twogroupsofscientistsdemonstratedlastweekfoxthefirsttimethatthe
随机试题
PaulaJones’caseagainstBillClintonisnow,for,allpossiblepoliticalco
[originaltext]Man:CanItakethedictionaryoutoftheroom?Woman:I’msorry.
[audioFiles]audio_eufm_j24_001(20082)[/audioFiles]A、Atachurch.B、Atalibrary
某建设公司于2015年2月份召开了公司职工代表大会,在大会上企业董事长张某对公司
共用题干 上官夫妇目前均刚过35岁,打算20年后即55岁时退休,估计夫妇俩退休
微球的主要特性A.聚合性B.稳定性C.主动性D.降低毒性E.栓塞性
下列选项中,对于缺陷的定性正确的是()。(A)油浸式站用(接地)变本体油
某一级耐火等级的棉花加工厂房,地上8层,层高4m,每层建筑面积2300㎡,使用人
发热,口渴喜饮,咳嗽气喘,咯黄痰,尿黄,舌红苔黄,脉滑数,为A.表热证 B.表
下列关于卖出看跌期权的说法中,正确的是()。A.资金有限的投资者适宜卖出无保
最新回复
(
0
)