28 sleep lets brain file memor

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1、28SleepLetsBrainFileMemoriesTosleep.Perchancetofile?FindingspublishedonlinethisweekbytheProceedingsoftheNationalAcademyofSciencesfurthersupportthetheorythatthebrainorganizesandstowsmemoriesformedduringthedaywhiletherestofthebodyiscatchingzzz's.GyorgyBuzsakiofRutgersUni

2、versity5andhiscolleaguesanalyzedthebrainwavesofsleepingratsandmice.Specifically,theyexaminedtheelectricalactivityemanatingfrom6thesomatosensoryneocortex(anareathatprocessessensoryinformation)andthehippocampus,whichisacenterforlearningandmemory.Thescientistsfoundthatosc

3、illationsinbrainwavesfromthetworegionsappeartobeintertwined.So-calledsleepspindles(burstsofactivityfromtheneocortex)werefollowedtensofmillisecondslaterbybeatsinthehippocampusknownasripples.Theteampositsthatthisinterplaybetweenthetwobrainregionsisakeystepinmemoryconsoli

4、dation.Asecondstudy,alsopublishedonlinethisweekbytheProceedingsoftheNationalAcademyofSciences,linksage-associatedmemorydeclinetohighglucoselevels.Previousresearchhadshownthatindividualswithdiabetessufferfromincreasedmemoryproblems.Inthenewwork,AntonioConvitofNewYorkUni

5、versitySchoolofMedicineandhiscollaboratorsstudied30peoplewhoseaverageagewas69toinvestigatewhethersugarlevels,whichtendtoincreasewithage,affectmemoryinhealthypeopleaswell.Thescientistsadministered11recalltests,brainscansandglucosetolerancetests,whichmeasurehowquicklysug

6、arisabsorbedfromthebloodbythebody'stissues.Subjectswiththepoorestmemoryrecollection,theteamdiscovered,alsodisplayedthepoorestglucosetolerance.Inaddition,theirbrainscansshowedmorehippocampusshrinkagethanthoseofsubjectsbetterabletoabsorbbloodsugar."Ourstudysuggeststhatth

7、isimpairment12maycontributetothememorydeficits13thatoccuraspeopleage."Convitsays."Anditraisestheintriguingpossibilitythatimprovingglucosetolerancecouldreversesomeage-associatedproblemsincognition.14"Exerciseandweightcontrolcanhelpkeepglucoselevelsincheck15,sotheremaybe

8、onemorereasontogotothegym.词汇：perchanceadv.偶然;可能onlinen.在线的stowvt.贮藏，堆装emanatevi.发源somatosensoryadj.体觉的neocortexn.新(大脑