腦成像介紹(英文版)PPT

BrainImaging某某某BrainImagingBrainimaginginvolvesanalyzingactivitywithinthebrainwhileperformingvarioustasks.Thisallowsustolinkbehaviorandbrainfunctiontohelpunderstandhowinformationisprocessed.Differenttypesofimagingtechniquesvaryintheirtemporal(time-based)andspatial(location-based)resolution（時間分辨率和空間分辨率）.Brainimagingisoftenusedin

cognitiveneuroscience(認知神經(jīng)學).5ImagingTechniquesTenseissaidtobeadeicticsystem,sincethereferencepointforthesystemisusuallytheactofspeaking.Deicticsystemsarethewaysinwhichaspeakerrelatesreferencestospaceandtimetothe“hereandnow”oftheutterance.Mostgrammaticaltensesystemsallowthespeakertodescribesituationsaspriorto,concurrentwithorfollowingtheactofspeaking.SoinEnglishwehavethethreetenses:past,future,andpresent.SPECT﹠PET(計算機斷層掃描和正電子成像術(shù))

SPECTandPETuseradioactiveisotopes(放射性同位素),whichareinjectedintothesubject'sbloodstreamandtakenupbythebrain.Byobservingwhichareasofthebraintakeuptheradioactiveisotope,wecanseewhichareasofthebrainaremoreactivethanotherareas.PEThassimilarspatialresolutiontoFMRI,butithasextremelypoortemporalresolution.SPECTCT掃描時，一束X射線穿過頭部，感光膠片形成圖像。這種方法可以產(chǎn)生腦部剖面成像。這種方法只顯示腦結(jié)構(gòu)，而非腦功能。PETEEG（腦電圖）

EEGmeasurestheelectricalfields（電場）generatedbylargepopulationsofneuronsinthecortex（腦皮層）byplacingaseriesofelectrodes（電極）onthescalpofthesubject.Thistechniquehasa