认知心理学课件何生

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1、NeuralCorrelatesofVisualAwarenessShengHeUniversityofMinnesota1V1LGN2PhysicalstimuliPerceptualexperienceSamestimuliDifferentperceptsDifferentstimuliSamepercept3PhysicalstimuliPerceptualexperienceLocalizedneuralactivity??Areasinwhichactivitieschangewithstimuli

2、arenotgoodcandidatesofNCC.differentsame4PhysicalstimuliPerceptualexperienceLocalizedneuralactivitysamedifferent??movingAreasinwhichactivitieschangewithperceptionaregoodcandidatesofNCC.static5PhysicalstimuliPerceptualexperienceLocalizedneuralactivity??orrival

3、ryAreasinwhichactivitieschangewithperceptionaregoodcandidatesofNCC.samedifferentor6PartI:adaptationtoinvisiblestimuli(withDonMacLeod)PartII:motionaftereffect(withEricCohen,XiaopingHu)PartIII:binocularrivalry--parallelpathwaystovisualawareness(withTomCarlson)

4、7PhysicalstimuliPerceptualexperienceLocalizedneuralactivitydifferentsameCanneuronsinareaXtellthedifference?AreasinwhichactivitieschangewithstimuliarenotgoodcandidatesofNCC.PartI:adaptationtoinvisiblestimuli8PhysicalstimuliPerceptualexperienceLocalizedneurala

5、ctivityV1??cancauseorientation-selectiveadaptation?9Spatialfrequency(cycles/degree)SensitivityResolutionlimit:50cpdUnresolvable10Orientation-SelectiveAdaptationAdaptTestSameOrientationHardtosee!NeedhighcontrastOrthogonalOrientationEasytosee!Needlowcontrast11

6、Tilt-aftereffect1213V1isthefirststageinthevisualsystemwhereorientationinformationisextracted:orientation-selectiveadaptationisonlypossibleatorafterV1.Ifwefindevidencefororientation-selectiveadaptation,thenitimpliesthattheorientationinformationhasatleastreach

7、edV1.14InvisibleverticalgratingAdaptTestSameOrientationNeedhighercontrastOrthogonalOrientationNeedlowercontrastResult15HeandMacLeod,Nature20011617Orientation-selectiveadaptationfromaninvisiblespatialpattern:invisibletotheobserverbutvisibleatV1.Thereisintra-c

8、orticallossofspatialinformation.V1activityisnotsufficientforvisualawareness.18PartISummaryFinespatialpatternscanbe“visible”atV1butinvisibletotheobserver.V1activityisnotalwayscorrelateddirectlywi