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The Hippocampus Is Coupled with the Default Network during Memory Retrieval but Not during Memory Encoding

The Hippocampus Is Coupled with the Default Network during Memory Retrieval but Not during Memory Encoding

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时间：2019-08-20

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1、TheHippocampusIsCoupledwiththeDefaultNetworkduringMemoryRetrievalbutNotduringMemoryEncoding112,31WillemHuijbers,CyrielM.A.Pennartz,RobertoCabeza,SanderM.Daselaar*1SwammerdamInstituteforLifeSciences,FacultyofScience,UniversityofAmsterdam,Amsterdam,TheNetherlands,2CenterforCognitiv

2、eNeuroscience,DukeUniversity,Durham,NorthCarolina,UnitedStatesofAmerica,3DepartmentforPsychologyandNeuroscience,DukeUniversity,Durham,NorthCarolina,UnitedStatesofAmericaAbstractThebrain’sdefaultmodenetwork(DMN)isactivatedduringinternally-orientedtasksandshowsstrongcoherenceinspon

3、taneousrestactivity.Despiteasurgeofrecentinterest,thefunctionalroleoftheDMNremainspoorlyunderstood.Interestingly,theDMNactivatesduringretrievalofpasteventsbutdeactivatesduringencodingofnoveleventsintomemory.Onehypothesisisthattheseopposingeffectsreflectadifferencebetweenattention

4、alorientingtowardsinternalevents,suchasretrievedmemories,vs.externalevents,suchasto-be-encodedstimuli.AnotherhypothesisisthathippocampalregionsarecoupledwiththeDMNduringretrievalbutdecoupledfromtheDMNduringencoding.ThepresentfMRIstudyinvestigatedthesetwohypothesesbycombiningarest

5、ing-statecoherenceanalysiswithataskthatmeasuredtheencodingandretrievalofbothinternally-generatedandexternally-presentedevents.ResultsrevealedthatthemainDMNregionswereactivatedduringretrievalbutdeactivatedduringencoding.Countertotheinternalorientinghypothesis,thispatternwasnotmodu

6、latedbywhethermemoryeventswereinternalorexternal.Consistentwiththehippocampalcouplinghypothesis,thehippocampusbehavedlikeotherDMNregionsduringretrievalbutnotduringencoding.Takentogether,ourfindingsclarifytherelationshipbetweentheDMNandtheneuralcorrelatesofmemoryretrievalandencodi

7、ng.Citation:HuijbersW,PennartzCMA,CabezaR,DaselaarSM(2011)TheHippocampusIsCoupledwiththeDefaultNetworkduringMemoryRetrievalbutNotduringMemoryEncoding.PLoSONE6(4):e17463.doi:10.1371/journal.pone.0017463Editor:GeorgesChapouthier,Universite´PierreetMarieCurie,FranceReceivedDecember1

8、0,2010;AcceptedJanuary21,2011;PublishedA

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