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
72
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.
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://kaotiyun.com/show/W8b7777K
0
大学英语六级
相关试题推荐
Psychologistsarefindingthathopeplaysasurprisinglyvitalroleingivingpeopleameasurableadvantageinrealmsas【B1】____
TheCounter-culturistsinthe1960sweredescribedasagangofyoungpeoplewho__________alcoholanddrugs.
Asthelecturerhassaid,talentisonething,whileits______expressionisanother.
Topreventthespreadoftheepidemic,thepublichealthorganizationcarriesoutfrequent______ontherestaurants.
Althoughstudentsmaybeina______position,teachersshouldtreatthemasequals.
Ifapersontalksabouthisweakpoints,hislistenerisexpectedtosaysomethinginthewayof_______.
Theschoolemphasizesitsintentiontoprovidehigh-qualitytrainingwhichenablesstudentstoachievetheirfullpotentialint
Theseareasrelyonagricultureutmost______,havingfewmineralresourcesandaminimumofindustrialdevelopment.
HehadstudiedSpanish,andhadgrownupinNewYorkCity--themostculturally_________placeinAmerica.
A、Theywerebothfamousactresses.B、Theywerebothpopularalltheirlives.C、Theywerebothrichandkind-hearted.D、Theywere
随机试题
A.规律宫缩至宫口扩张3cmB.宫口扩张3~8cmC.宫口扩张3cm至10cmD.规律宫缩至宫口开全E.规律宫缩至宫口扩张8cm潜伏期
以下不属于童年期心理发展年龄特点的是
患儿男,10岁。以大叶性肺炎收入院。入院当晚,护士正在巡视病房。此时患儿对护士说:“你们都是坏人,把我的爸爸妈妈赶走了,平时都是他们陪我入睡的。”护士正确的回答是()
下列选项中,( )不是设计或施工总分包模式的优点。
下列私募基金的募集行为错误的是()。
甲有限责任公司的股东张某未征求其他股东意见就将自己在公司中的股权转让给股东以外的李某。对此下列表述正确的有()。
丽岛实业是香港一家餐饮企业集团,已经在香港经营餐饮业30余年。丽岛实业在香港开设了20多家“丽岛大酒楼”、“丽岛皇宫”等命名的传统粤菜酒楼,丽岛实业的酒楼面向中、高档消费者,虽然菜式价格高于一般粤菜酒楼,但其菜式以高质量取胜,生意门庭若市,已经形成了一批忠
材料:高三学生刘娜平时成绩很优秀,但在学校组织的第一次、第二次高考模拟考试中,成绩大幅度下滑,从此她就开始惧怕考试。每当考试的前一晚,她就会失眠,失眠后总觉得身体不适,慢慢发展到只要进入考场就会肚子疼,以至于无法参加考试,到医院检查后各项生理指标
有的地质学家认为,如果地球的未勘探地区中单位面积的平均石油储藏量能和已勘探地区一样的话,那么,目前关于地下未开采的能源含量的正确估计因此要乘上一万倍。如果地质学家的这一观点成立,那么,我们可以得出结论:即使未来的石油消耗量加速增长,我们至少可以再满足5个世
Celebritiesandthemediahaveadistinctly’love-hate’relationshipand,whilsttheyrecognizetheirmutualdependency,striki
最新回复
(
0
)