新增文章汇总.doc

《新增文章汇总.doc》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、*第二十四篇SleepLetsBrainFileMemories　　Tosleep.Perchancetofile?FindingspublishedonlinethisweekbytheProceedingsoftheNationalAcademyofSciencesfurthersupportthetheorythatthebrainorganizesandstowsmemoriesformedduringthedaywhiletherestofthebodyiscatchingzzz's.　　Gyorg

2、yBuzsakiofRutgersUniversity5andhiscolleaguesanalyzedthebrainwavesofsleepingratsandmice.Specifically,theyexaminedtheelectricalactivityemanatingfrom6thesomatosensoryneocortex(anareathatprocessessensoryinformation)andthehippocampus,whichisacenterforlearningand

3、memory.Thescientistsfoundthatoscillationsinbrainwavesfromthetworegionsappeartobeintertwined.So-calledsleepspindles(burstsofactivityfromtheneocortex)werefollowedtensofmillisecondslaterbybeatsinthehippocampusknownasripples.Theteampositsthatthisinterplaybetwee

4、nthetwobrainregionsisakeystepinmemoryconsolidation.Asecondstudy,alsopublishedonlinethisweekbytheProceedingsoftheNationalAcademyofSciences,linksage-associatedmemorydeclinetohighglucoselevels.　　Previousresearchhadshownthatindividualswithdiabetessufferfromincr

5、easedmemoryproblems.Inthenewwork,AntonioConvitofNewYorkUniversitySchoolofMedicineandhiscollaboratorsstudied30peoplewhoseaverageagewas69toinvestigatewhethersugarlevels,whichtendtoincreasewithage,affectmemoryinhealthypeopleaswell.Thescientistsadministered11re

6、calltests,brainscansandglucosetolerancetests,whichmeasurehowquicklysugarisabsorbedfromthebloodbythebody'stissues.Subjectswiththepoorestmemoryrecollection,theteamdiscovered,alsodisplayedthepoorestglucosetolerance.Inaddition,theirbrainscansshowedmorehippocamp

7、usshrinkagethanthoseofsubjectsbetterabletoabsorbbloodsugar."Ourstudysuggeststhatthisimpairment12maycontributetothememorydeficits13thatoccuraspeopleage."Convitsays."Anditraisestheintriguingpossibilitythatimprovingglucosetolerancecouldreversesomeage-associate

8、dproblemsincognition.14"Exerciseandweightcontrolcanhelpkeepglucoselevelsincheck15,sotheremaybeonemorereasontogotothegym.词汇：perchance[p?'t?ɑ:ns]adv.偶然；可能online['?nlain]n.在线的stow[st?u]vt.贮藏，堆装emanate['em