认知心理学课件何生.ppt

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1、NeuralCorrelatesofVisualAwarenessShengHeUniversityofMinnesota1V1LGN2PhysicalstimuliPerceptualexperienceSamestimuliDifferentperceptsDifferentstimuliSamepercept3PhysicalstimuliPerceptualexperienceLocalizedneuralactivity??AreasinwhichactivitieschangewithstimuliarenotgoodcandidatesofNCC.differents

2、ame4PhysicalstimuliPerceptualexperienceLocalizedneuralactivitysamedifferent??movingAreasinwhichactivitieschangewithperceptionaregoodcandidatesofNCC.static5PhysicalstimuliPerceptualexperienceLocalizedneuralactivity??orrivalryAreasinwhichactivitieschangewithperceptionaregoodcandidatesofNCC.samed

3、ifferentor6PartI:adaptationtoinvisiblestimuli(withDonMacLeod)PartII:motionaftereffect(withEricCohen,XiaopingHu)PartIII:binocularrivalry--parallelpathwaystovisualawareness(withTomCarlson)7PhysicalstimuliPerceptualexperienceLocalizedneuralactivitydifferentsameCanneuronsinareaXtellthedifference?A

4、reasinwhichactivitieschangewithstimuliarenotgoodcandidatesofNCC.PartI:adaptationtoinvisiblestimuli8PhysicalstimuliPerceptualexperienceLocalizedneuralactivityV1??cancauseorientation-selectiveadaptation?9Spatialfrequency(cycles/degree)SensitivityResolutionlimit:50cpdUnresolvable10Orientation-Sel

5、ectiveAdaptationAdaptTestSameOrientationHardtosee!NeedhighcontrastOrthogonalOrientationEasytosee!Needlowcontrast11Tilt-aftereffect1213V1isthefirststageinthevisualsystemwhereorientationinformationisextracted:orientation-selectiveadaptationisonlypossibleatorafterV1.Ifwefindevidencefororientation

6、-selectiveadaptation,thenitimpliesthattheorientationinformationhasatleastreachedV1.14InvisibleverticalgratingAdaptTestSameOrientationNeedhighercontrastOrthogonalOrientationNeedlowercontrastResult15HeandMacLeod,Nature20011617Orientation-selectiveadaptationfromaninvisiblespatialpattern:invisible

7、totheobserverbutvisibleatV1.Thereisintra-corticallossofspatialinformation.V1activityisnotsufficientforvisualawareness.18PartISummaryFinespatialpatternscanbe“visible”atV1butinvisibletotheobserver.V1activityisnotalwayscorrelateddirectlywi