首页
登录
职称英语
We sometimes think humans are uniquely vulnerable to anxiety, but stress see
We sometimes think humans are uniquely vulnerable to anxiety, but stress see
游客
2024-04-10
28
管理
问题
We sometimes think humans are uniquely vulnerable to anxiety, but stress seems to affect the immune defenses of lower animals too In one experiment, for example, behavioral immunologist(免疫学家)Mark Laudenslager, at the University of Denver, gave mild electric shocks to 24 rats. Half the animals could switch off the current by turning a wheel in their enclosure, while the other half could not The rats in the two groups were paired so that each time one rat turned the wheel it protected both itself and its helpless partner from the shock. Laudenslager found that the immune response was depressed below normal in the helpless rats but not in those that could turn off the electricity. What he has demonstrated, he believes, is that lack of control over an event, not the experience itself, is what weakens the immune system.
Other researchers agree. Jay Weiss, a psychologist at Duke University School of Medicine, has shown that animals who are allowed to control unpleasant stimuli don’t develop sleep disturbances or changes in brain chemistry typical of stressed rats. But if the animals are confronted with situations they have no control over, they later behave passively when faced with experiences they can control. Such findings reinforce psychologists’ suspicions that the experience or perception of helplessness is one of the most harmful factors in depression.
One of the most startling examples of how the mind can alter the immune response was discovered by chance. In 1975 psychologist Robert Ader at the University of Rochester School of Medicine conditioned(使形成条件反射)mice to avoid saccharin(糖精)by simultaneously feeding them the sweetener and injecting them with a drug that while suppressing their immune systems caused stomach upsets. Associating the saccharin with the stomach pains, the mice quickly learned to avoid the sweetener. In order to extinguish this dislike for the sweetener, Ader reexposed the animals to saccharin, this time without the drug, and was astonished to find that those mice that had received the highest amounts of sweetener during their earlier conditioning died. He could only speculate that he had so successfully conditioned the rats that saccharin alone now served to weaken their immune systems enough to kill them. [br] Laudenslager’s experiment showed that the immune system of those rats who could turn off the electricity _____.
选项
A、was strengthened
B、was not affected
C、was altered
D、was weakened
答案
B
解析
第1段第5句提到:Laudenslager发现那些无助的老鼠的免疫反应被削弱了,低于正常水平,而那些能切断电源的老鼠却没有。因此,B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3548475.html
相关试题推荐
Amajoringredienttotakingthepainoutofastressfuldayatworkisasu
Amajoringredienttotakingthepainoutofastressfuldayatworkisasu
Amajoringredienttotakingthepainoutofastressfuldayatworkisasu
Amajoringredienttotakingthepainoutofastressfuldayatworkisasu
Amajoringredienttotakingthepainoutofastressfuldayatworkisasu
Amajoringredienttotakingthepainoutofastressfuldayatworkisasu
[originaltext]VisitorstoBritainaresometimessurprisedtolearnthatnew
Angerisanemotionthatcanbedifficulttodealwith.Sometimesit’sexper
Angerisanemotionthatcanbedifficulttodealwith.Sometimesit’sexper
Angerisanemotionthatcanbedifficulttodealwith.Sometimesit’sexper
随机试题
[originaltext]W:Hi,I’mnewhere,andIwaswonderinghowIcouldgetalibrar
Thelinkbetweenhealthandincomeseemsprettyuncontroversial.【C1】______al
[audioFiles]audio_eufm_j42_001(20082)[/audioFiles]A、Theyalwaysdothesamejob
当衰退时期出现时,一些本来可以寻找工作的劳动者由于对在某一可行的工资率水平下找到
关于硝苯地平的作用,下述哪项是错误的A.降低血液粘滞度 B.几乎无频率依赖性
关于水提醇沉法的操作,下列说法正确的是A.药液趁热加入乙醇 B.不可用乙醇洗涤
Thechangeinthatvillagewasmiraculou
微动开关在机构中的安装宜设置固定的安装位置,保证后期传感器进行更换或检修时传感器
(2017年真题)某女,40岁。感冒2日,症见发热,微恶风,头痛,咳嗽,口干,咽
非居民个人约翰,2021年9月在我国某出版社出版一部长篇小说,取得稿酬收入100
最新回复
(
0
)