BrainProducts-Presentation-VEP优质PPT.ppt

BrainProducts-Presentation-VEP优质PPT.ppt

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BrainVisionAnalyzerProfessional,ThemostadvancedandeasytouseEEGanalysispackage!

@#@,Welcometo.,Packedwithfeaturestohelpyoumakethemostoutofyourdata.,VISUALLYEVOKEDPOTENTIALDATA,Onthenextcoupleofslideswewanttodemonstratetheeaseandpowerofanalyzingvisualevokedpotentialdatawiththehelpofthesophisticatedtoolsimplementedin,BrainVisionAnalyzerProfessional,Wewilltakeyouthroughallthenecessarystepsfromdatainspectionthroughthefullprocessofdataanalysistothebuildingofgrandaveragesandpeakdetection.,Duringthisprocesswewillperformthefollowingsteps,Grandaveragebuildingforalldatasetsofacategory.,Peakdetectionandexport（N1,N2,P2,P3,LPC）.,Averagebuildingforallcategories.,Segmentationofallsignificanteventsintoseparatebranches.,Baselinecorrectionofallsegments.,Artefactrejection（amplitude,gradient,rangeandflatspots）.,OcularcorrectionofdataforVEOGandHEOGartefacts.,Globalsegmentationforallsignificantevents.,RereferencingfromCzreferencetolinkedears.,Inspectionoftherawdataforartefacts.,Navigatingandinspectingyourdataset.,Tonavigatewithinyourdataset,youcanusethenavigationbaratthebottomoftheBrainVisionAnalyzerwindow.,Youcanstepforwardandbackwardwithinyourdatasetinincrementsofthewindowsizeorinonesecondincrements.Youcanalsojumptoanydesiredpositionwithinyourdatasetbyclickingintothescrollbarorintothemarkerfieldatthetopofthenavigationarea.,Navigatingandvisuallyinspectingyourdataset.,Asyoucaneasilyseefromthepictureontheleft,thereareanumberofblinkartefactsinourdataset.Youcanalsosee,thatthedatawasobviouslyrecordedwithCzreferenceandthatchannelT7seemstocontainalotofnoise.Letshavealook.,Navigatingandvisuallyinspectingyourdataset.,LetshavealookatapossibleblinkinordertoshowyouthegreatfeaturesBrainVisionAnalyzersupportsforthevisualinspectionofdata.Simplymarkatimerangeinyourdatawithyourmouse.Itwillshowuphighlightedinlightblue.Thenreleasethemousebuttontoopenthecontextmenu.,Navigatingandvisuallyinspectingyourdataset.,Asyoucansee,wehaveanumberofchoicesofwhattodowiththemarkedarea.WecouldchoosetoperformanFFTforourtimerange,displaya3D-maporevenaCSD-map.Wewillchoosethemapoptiontodisplaythetopographicdistributionofthevoltagesforourtimerange.,Navigatingandvisuallyinspectingyourdataset.,Ascouldbeexpected,thevoltagedistributionshowsthetypicalpatternforablinkartefactwithstrongandrathersymmetricalactivityatfrontalsitesandwithpronouncedattenuationoftheblinkpropagationtowardsposteriorsites.Letshavealookatanothertypeofartefactinourdata.,Navigatingandvisuallyinspectingyourdataset.,Aswassaidbefore,channelT7seemstocontainalotofnoise.Thiscouldbedotomovementartefactsfromthejawsaswellastoabadlyseatedelectrodeoranynumberofotherreasons.Letshavealookatthefrequencydistributionwithinthischannel.,Navigatingandvisuallyinspectingyourdataset.,ThistimewemarkedtheentirevisibletimerangewiththemouseandchosetheFFToptionfromtheautomaticallyopenedcontextmenu.ByreleasingthemouseovertheFFTentryweopentheFFTwindowtoviewthefrequencydistributionoftheselectedchannels.,Navigatingandvisuallyinspectingyourdataset.,Asinanyotherwindowwecanchoosethechannelstoviewbymarkingtheirnameswiththemouseandthendouble-clicking.WechosetoviewT7only.ChannelT7containsalotofactivitythroughouttheavailablespectrumwiththeexceptionof50Hertzindicatingthata50Hznotchfilterwasused.,Onceyouaresatisfiedthatyouhaveseenthetypesofartefactspresentinyourdata,youarereadytocorrectorrejecttheseartefacts.-ButfirstletsrereferencethedatasetfromtheCztoA1A2reference（linkedears）.,Rereferencingyourdatasettolinkedears.,Justasanyotheroperationyoumightwanttoperformthatchangesthecharacteristicsofyourdataset,rereferencingyourdataisconsideredasaTransformation“withinBrainVisionAnalyzer.Therefore,youcanfindtherereferencingroutinetogetherwiththenumerousotherdatamodifyingoperationsinthemenumainprogrammenuTransformation“.Letschooseitandseewhatitoffers.,Rereferencingyourdatasettolinkedears.,ThefirstwindowoftheNewReferenceentryformrequeststheinformationaboutwhichelectrodeswillformthenewreference.-SincewewanttorereferencetoA1A2（linkedears）,wewillchoosejustthesetwo.Obviously,youcouldalsohavechosenallelectrodesforaveragereferenceoranycombinationyoudesire.,Rereferencingyourdatasettolinkedears.,Inthesecondwindowoftheentryformyoucanspecifythechannelsthatthenewreferenceshouldbeappliedtoandwhethertheremainingchannelsthatare