1999
Motion Opponency in Visual Cortex
Heeger D, Boynton G, Demb J, Seidemann E, Newsome W. Motion Opponency in Visual Cortex. Journal Of Neuroscience 1999, 19: 7162-7174. PMID: 10436069, PMCID: PMC6782843, DOI: 10.1523/jneurosci.19-16-07162.1999.Peer-Reviewed Original ResearchConceptsFunctional magnetic resonance imagingVisual motion perceptionMotion opponencyMotion perceptionVisual cortexSecondary visual cortical areasHuman MT complexHuman visual cortexDirection-selective signalsVisual cortical areasSensitive brain areasPrimary visual cortexMacaque monkey brainMagnetic resonance imagingPopulations of neuronsMultiunit electrophysiological recordingsBrain activityPerceptual studiesNeuronal correlatesFMRI measurementsArea MTCortical areasBrain areasMonkey brainResonance imagingNeuronal basis of contrast discrimination
Boynton G, Demb J, Glover G, Heeger D. Neuronal basis of contrast discrimination. Vision Research 1999, 39: 257-269. PMID: 10326134, DOI: 10.1016/s0042-6989(98)00113-8.Peer-Reviewed Original ResearchConceptsVisual cortical areasAverage neuronal activityFunctional magnetic resonance imagingFMRI responsesNeuronal activityCortical areasEarly visual cortical areasMagnetic resonance imagingVisual areas V1Contrast increment thresholdsIncrement thresholdsEarly visual cortexNeuronal responsesBrain areasVisual cortexResonance imagingArea V1Neuronal basisPooled activityStimulus intervalStimulus contrastBaseline contrastNeuronal signalsBrain activityHuman brain activity
1998
Functional Magnetic Resonance Imaging of Early Visual Pathways in Dyslexia
Demb J, Boynton G, Heeger D. Functional Magnetic Resonance Imaging of Early Visual Pathways in Dyslexia. Journal Of Neuroscience 1998, 18: 6939-6951. PMID: 9712663, PMCID: PMC6792964, DOI: 10.1523/jneurosci.18-17-06939.1998.Peer-Reviewed Original ResearchConceptsFunctional magnetic resonance imagingMagnetic resonance imagingBrain activityResonance imagingM pathwayReduced brain activityPrimary visual cortexMotion-sensitive areasSpeed discriminationPerceptual thresholdHigher V1Pathway abnormalitiesVisual motion perceptionEarly visual pathwayGroups of dyslexicsVisual cortexVisual pathwayLower perceptual thresholdsExtrastriate areasArea MTMagnocellular pathwayStimulus speedPathway inputEarly visual systemNormal readers
1997
Brain activity in visual cortex predicts individual differences in reading performance
Demb J, Boynton G, Heeger D. Brain activity in visual cortex predicts individual differences in reading performance. Proceedings Of The National Academy Of Sciences Of The United States Of America 1997, 94: 13363-13366. PMID: 9371851, PMCID: PMC24314, DOI: 10.1073/pnas.94.24.13363.Peer-Reviewed Original ResearchConceptsBrain activityIndividual differencesSpecific visual pathwaysM pathwayCortical visual areasPrimary visual cortexFunctional magnetic resonance imagingMagnetic resonance imagingPathway abnormalitiesVisual cortexVisual pathwayResonance imagingVisual areasMagnocellular pathwayReading abilityPathway inputSignificant correlationReduced activityDyslexicsDyslexiaPathwayStrong relationshipActivityAbnormalitiesCortex
1996
Functional Magnetic Resonance Imaging of Semantic Memory Processes in the Frontal Lobes
Gabrieli J, Desmond J, Demb J, Wagner A, Stone M, Vaidya C, Glover G. Functional Magnetic Resonance Imaging of Semantic Memory Processes in the Frontal Lobes. Psychological Science 1996, 7: 278-283. DOI: 10.1111/j.1467-9280.1996.tb00374.x.Peer-Reviewed Original ResearchFunctional magnetic resonance imagingSemantic encodingMemory processesMemory functional magnetic resonance imagingSemantic memory processesInferior prefrontal regionsInferior prefrontal cortexFrontal lobe activationSemantic memory performanceBrain functionIndividual brain functionPerceptual encodingImplicit retrievalRepetition primingMemory performancePrefrontal regionsSemantic experiencePrefrontal cortexCognitive functionNeural activityFrontal lobeEncodingWordsSuch encodingsMagnetic resonance imaging
1995
Semantic encoding and retrieval in the left inferior prefrontal cortex: a functional MRI study of task difficulty and process specificity
Demb J, Desmond J, Wagner A, Vaidya C, Glover G, Gabrieli J. Semantic encoding and retrieval in the left inferior prefrontal cortex: a functional MRI study of task difficulty and process specificity. Journal Of Neuroscience 1995, 15: 5870-5878. PMID: 7666172, PMCID: PMC6577672, DOI: 10.1523/jneurosci.15-09-05870.1995.Peer-Reviewed Original ResearchConceptsLeft inferior prefrontal cortexFunctional magnetic resonance imagingInferior prefrontal cortexSemantic encodingRepetition primingTask difficultyPrefrontal cortexPrefrontal cortical functionFunctional MRI studyIntentional recollectionLIPC activationNonsemantic encodingSemantic processingExecutive systemTime wordsSame wordsNeural activityRelative difficultyEncodingWordsCortical functionProcess specificitySemantic informationLine retrievalPriming