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
考研
A new study on mice uncovers some answers that could someday offer a powerful target for eliminating the recurrence of bad memor
A new study on mice uncovers some answers that could someday offer a powerful target for eliminating the recurrence of bad memor
admin
2014-05-20
44
问题
A new study on mice uncovers some answers that could someday offer a powerful target for eliminating the recurrence of bad memories in humans, especially known to those who suffer from post-traumatic stress disorder(PTSD: mental disorder caused by accidents of emergency).
"Fear memories are the most robust memories—they can last over a lifetime," says Nadine Gogol-la, a biologist at Harvard University and lead author on the paper published recently in the journal Science. "You can push them far back, but spontaneous recovery and relapses will happen. " Until now, science has been unable to stop this process—in humans or in mice.
By repeating the previously reported rat findings, Gogolla and her colleagues found that at some point during a young mouse’s development—between about 16 and 23 days postnatal—a molecular net of sorts is cast over a region of the brain called the amygdala, effectively crystallizing formerly changeable memories.
"It looks just like what you would expect from a fisherman’s net," says Gogolla of the protein matrix(a living part in which something is formed)under the microscope. "And it acts as a structural constraint on the cells. How it does that, nobody really knows. " But the result is that memories are held inside. What the researchers did learn was that by cutting that net—with an injection of an enzyme that digests the chains linking the matrix together—memories could be once again destabilized.
"The drug cuts the net into its pieces," Gogolla says, "just like when you cut the strings of a net and it falls apart. " Then, for a couple of weeks, the original youthful plasticity in the neuronal circuits of the amygdala is regained and any bad memory formed after the matrix digestion could be subsequently eliminated through "extinction" therapy, a common treatment during which a patient is presented with the original fear trigger but in a context that is not fearful. When the treatment was given after a mouse underwent fear conditioning, however, extinction was unable to cut out that memory completely.
"Because the treatment has to occur before a traumatic event, it’s hard to make it immediately available," notes Gogolla. " But it does help us in finding the underlying mechanisms. " Eventually, she hopes tools can be found that can be applied after fear—inducing experiences, and that translate from mice to humans. This would be welcome relief for the approximately 20 percent of all military personnel who have returned from Iraq and Afghanistan reporting symptoms of PTSD, not to mention for heartbroken couples.
What was confirmed by Gogolla’s study on extinction therapy?
选项
A、It is already available to humans.
B、It will eliminate fearful memories.
C、It functions under fearful conditions.
D、It works before fearful experiences occurred.
答案
D
解析
细节题。由题干关键词extinction therapy定位至第五段和第六段。作者在第五段提到“消退疗法”是一种常见的疗法,即在一种并不可怕的情境下,向患者再现原先引起恐惧的事物。并在本段末句进一步说明:如果在老鼠遭遇了恐怖经历之后再进行这种疗法,就不能把恐怖记忆彻底清除了。为了证实这一点,作者在第六段首句再次提及:“消退疗法”必须在创伤事件发生之前进行,这与选项[D]意思一致,故选项[D]为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/8tO4777K
0
考研英语一
相关试题推荐
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
Ourape-menforefathershadnoobviousnaturalweaponsinthestrugglefor【1】intheopen.Theyhadneitherthepowerfulteethno
随机试题
(2017年4月单选第11题)人们通过语言传达的只是有限的信息,必须要从谈话背景中进行推论和解释。这种背景属于()
对毒物的毒性影响最大的环境因素是
下列哪项不是总大肠菌群的特征
中国人民银行应于()个工作日内对银行报送的基本存款账户、临时存款账户和预算单位专用存款账户的开户资料的合规性予以审核,符合开户条件的,予以核准。
用于保障家庭基本开支的费用,可以选择的储存方式有()
甲上市公司(以下简称“甲公司”)拥有一条由专利权X、设备Y以及设备Z组成的生产线,专门用于生产产品W。该生产线于2×08年1月投产,至2×14年12月31日已连续生产7年。甲公司按照不同的生产线进行管理,产品W存在活跃市场。生产线生产的产品W,经包装机H进
申请领取导游证的人员,对旅游行政部门逾期不予颁发或不予答复的行为,可以采取的司法救济途径是()。
=_______.
已知程序段:S=0Fori=1To10Step2s=s+1i=i*2Nexti当循环结束后,变量i的值为______,变量s的值为______。
操作系统是()。
最新回复
(
0
)