2023
Spatiotemporal features of neurovascular (un)coupling with stimulus-induced activity and hypercapnia challenge in cerebral cortex and olfactory bulb
James S, Sanggaard S, Akif A, Mishra S, Sanganahalli B, Blumenfeld H, Verhagen J, Hyder F, Herman P. Spatiotemporal features of neurovascular (un)coupling with stimulus-induced activity and hypercapnia challenge in cerebral cortex and olfactory bulb. Cerebrovascular And Brain Metabolism Reviews 2023, 43: 1891-1904. PMID: 37340791, PMCID: PMC10676132, DOI: 10.1177/0271678x231183887.Peer-Reviewed Original ResearchConceptsVasodilatory responseCerebral cortexNeurovascular couplingOlfactory bulbNeuronal activityBrief sensory stimuliRegional neurovascular couplingStimulus-induced activityHypercapnia challengeVascular toneNeuronal deactivationHemodynamic responseNeuronal excitabilityNeuronal responsesCalcium transientsBrain functionHemodynamic signalsSensory stimuliVasodilationHypercapniaCortexMiceCareful appraisalStimuliMetabolic wasteDecreased but diverse activity of cortical and thalamic neurons in consciousness-impairing rodent absence seizures
McCafferty C, Gruenbaum B, Tung R, Li J, Zheng X, Salvino P, Vincent P, Kratochvil Z, Ryu J, Khalaf A, Swift K, Akbari R, Islam W, Antwi P, Johnson E, Vitkovskiy P, Sampognaro J, Freedman I, Kundishora A, Depaulis A, David F, Crunelli V, Sanganahalli B, Herman P, Hyder F, Blumenfeld H. Decreased but diverse activity of cortical and thalamic neurons in consciousness-impairing rodent absence seizures. Nature Communications 2023, 14: 117. PMID: 36627270, PMCID: PMC9832004, DOI: 10.1038/s41467-022-35535-4.Peer-Reviewed Original ResearchConceptsThalamic neuronsAbsence seizuresSeizure onsetNeuronal firingConsciousness-impairing seizuresFemale rat modelLow-frequency electroencephalographic activityFunctional magnetic resonanceBehavioral arrestRat modelRhythmic firingTransient initial peakFiring increasesSeizuresNeuronal mechanismsElectroencephalographic activityNeuronsBrain state changesBrief episodesFiring decreasesInitial peakFiringMagnetic resonanceDistinct patternsOnset
2022
Thalamic activations in rat brain by fMRI during tactile (forepaw, whisker) and non-tactile (visual, olfactory) sensory stimulations
Sanganahalli BG, Thompson GJ, Parent M, Verhagen JV, Blumenfeld H, Herman P, Hyder F. Thalamic activations in rat brain by fMRI during tactile (forepaw, whisker) and non-tactile (visual, olfactory) sensory stimulations. PLOS ONE 2022, 17: e0267916. PMID: 35522646, PMCID: PMC9075615, DOI: 10.1371/journal.pone.0267916.Peer-Reviewed Original ResearchConceptsDorsal lateral geniculate nucleusVentral posterior medialVentral posterior lateralThalamic activationFunctional MRIPosterior medial thalamic nucleusMedial thalamic nucleiSensory stimuliLateral geniculate nucleusPost-mortem humanOlfactory stimuliHigh-field functional MRIField functional MRIWhisker stimuliDeep brain regionsRat thalamusThalamic nucleiGeniculate nucleusMediodorsal nucleusRat brainInferior colliculusThalamusDifferent sensory stimuliCortical activationCortical activity
2020
Thalamic Stimulation Improves Postictal Cortical Arousal and Behavior
Xu J, Galardi MM, Pok B, Patel KK, Zhao CW, Andrews JP, Singla S, McCafferty CP, Feng L, Musonza ET, Kundishora AJ, Gummadavelli A, Gerrard JL, Laubach M, Schiff ND, Blumenfeld H. Thalamic Stimulation Improves Postictal Cortical Arousal and Behavior. Journal Of Neuroscience 2020, 40: 7343-7354. PMID: 32826310, PMCID: PMC7534908, DOI: 10.1523/jneurosci.1370-20.2020.Peer-Reviewed Original ResearchConceptsDeep brain stimulationCentral lateral nucleusBilateral deep brain stimulationCortical slow-wave activityPostictal stateSlow wave activityPostictal periodImpaired consciousnessRefractory epilepsyLateral nucleusBrain stimulationNatural slow-wave sleepModest behavioral improvementCortical slow wavesNovel therapeutic strategiesSlow-wave sleepDisorders of consciousnessBehavioral tasksDepressed consciousnessDBS treatmentThalamic stimulationElectrical hippocampal stimulationFemale ratsHigh success rateRat model
2019
Up and Down States of Cortical Neurons in Focal Limbic Seizures
Yue Z, Freedman IG, Vincent P, Andrews JP, Micek C, Aksen M, Martin R, Zuckerman D, Perrenoud Q, Neske GT, Sieu LA, Bo X, Cardin JA, Blumenfeld H. Up and Down States of Cortical Neurons in Focal Limbic Seizures. Cerebral Cortex 2019, 30: 3074-3086. PMID: 31800015, PMCID: PMC7197089, DOI: 10.1093/cercor/bhz295.Peer-Reviewed Original ResearchConceptsFocal limbic seizuresDeep anesthesiaLimbic seizuresCortical neuronsVivo whole-cell recordingsDepressed cortical functionInput resistanceNeocortical slow wavesSubcortical arousal systemsLoss of consciousnessWhole-cell recordingsCortical-subcortical networksSeizure propagationMembrane potentialRat modelCortical functionTemporal lobeSeizuresCortical arousalExtracellular recordingsElectrophysiological propertiesCortical electrophysiologyFiring rateAnesthesiaArousal system
2016
Restoring Conscious Arousal During Focal Limbic Seizures with Deep Brain Stimulation
Kundishora AJ, Gummadavelli A, Ma C, Liu M, McCafferty C, Schiff ND, Willie JT, Gross RE, Gerrard J, Blumenfeld H. Restoring Conscious Arousal During Focal Limbic Seizures with Deep Brain Stimulation. Cerebral Cortex 2016, 27: 1964-1975. PMID: 26941379, PMCID: PMC5964488, DOI: 10.1093/cercor/bhw035.Peer-Reviewed Original ResearchConceptsFocal limbic seizuresDeep brain stimulationLimbic seizuresBrain stimulationImpaired consciousnessNetwork inhibition hypothesisRisk of mortalityNovel therapeutic approachesDual-site stimulationCentral lateral nucleusDisorders of consciousnessQuality of lifeFocal limbicSurgical therapyRefractory epilepsyFocal seizuresNucleus oralisBilateral stimulationIntralaminar thalamusRat modelTherapeutic approachesLateral nucleusBehavioral arousalConscious arousalResponsive neurostimulation
2015
Decreased Subcortical Cholinergic Arousal in Focal Seizures
Motelow JE, Li W, Zhan Q, Mishra AM, Sachdev RN, Liu G, Gummadavelli A, Zayyad Z, Lee HS, Chu V, Andrews JP, Englot DJ, Herman P, Sanganahalli BG, Hyder F, Blumenfeld H. Decreased Subcortical Cholinergic Arousal in Focal Seizures. Neuron 2015, 85: 561-572. PMID: 25654258, PMCID: PMC4319118, DOI: 10.1016/j.neuron.2014.12.058.Peer-Reviewed Original ResearchConceptsTemporal lobe seizuresFocal temporal lobe seizuresReduced cholinergic neurotransmissionBilateral temporal lobesLoss of consciousnessPedunculopontine tegmental nucleusQuality of lifeBrainstem arousal systemsFunctional magnetic resonanceSeizure spreadCholinergic neuronsImpaired consciousnessFocal seizuresBasal forebrainAnterior hypothalamusCholinergic neurotransmissionTegmental nucleusLateral septumCortical functionRodent modelsTemporal lobeSubcortical regionsSeizuresImpair consciousnessSubcortical arousal
2011
Where fMRI and Electrophysiology Agree to Disagree: Corticothalamic and Striatal Activity Patterns in the WAG/Rij Rat
Mishra AM, Ellens DJ, Schridde U, Motelow JE, Purcaro MJ, DeSalvo MN, Enev M, Sanganahalli BG, Hyder F, Blumenfeld H. Where fMRI and Electrophysiology Agree to Disagree: Corticothalamic and Striatal Activity Patterns in the WAG/Rij Rat. Journal Of Neuroscience 2011, 31: 15053-15064. PMID: 22016539, PMCID: PMC3432284, DOI: 10.1523/jneurosci.0101-11.2011.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBrainBrain MappingBrain WavesCerebral CortexCerebrovascular CirculationCorpus StriatumDisease Models, AnimalElectroencephalographyElectrophysiologyEpilepsyImage Processing, Computer-AssistedLaser-Doppler FlowmetryMagnetic Resonance ImagingNicotinic AntagonistsOxygenRatsRats, WistarThalamusTubocurarineVibrissaeConceptsCerebral blood flowCerebral blood volumeLocal field potentialsNeuronal activityLaser Doppler cerebral blood flowSubcortical structuresWAG/Rij ratsNeuronal activity decreasesHuman absence epilepsySpike-wave dischargesWAG/RijMultiunit activity recordingsFMRI signalsFunctional magnetic resonance imaging (fMRI) signalsMagnetic resonance imaging signalsFMRI decreasesCBF decreaseHemodynamic changesCerebral cortexBasal gangliaSomatosensory cortexAbsence epilepsyWhisker stimulationBlood flowAnimal models
2000
Corticothalamic Inputs Control the Pattern of Activity Generated in Thalamocortical Networks
Blumenfeld H, McCormick D. Corticothalamic Inputs Control the Pattern of Activity Generated in Thalamocortical Networks. Journal Of Neuroscience 2000, 20: 5153-5162. PMID: 10864972, PMCID: PMC6772273, DOI: 10.1523/jneurosci.20-13-05153.2000.Peer-Reviewed Original ResearchConceptsParoxysmal oscillationsThalamic burstsReceptor antagonist CGP 35348Corticothalamic tractsSpindle wavesAntagonist CGP 35348Receptor antagonist picrotoxinSlow-wave sleepHz oscillationsHigh-frequency burstsNormal action potentialPerigeniculate neuronsCGP 35348Antagonist picrotoxinSlow IPSPCorticothalamic inputsFast IPSPsThalamocortical neuronsCortical influencesAbsence seizuresBurst firingCortical neuronsCortical firingThalamocortical networkCorticothalamic networks
1990
Facilitatory and inhibitory transmitters modulate calcium influx during action potentials in Aplysia sensory neurons
Blumenfeld H, Spiral M, Kandel E, Siegelbaum S. Facilitatory and inhibitory transmitters modulate calcium influx during action potentials in Aplysia sensory neurons. Neuron 1990, 5: 487-499. PMID: 1976321, DOI: 10.1016/0896-6273(90)90088-w.Peer-Reviewed Original ResearchConceptsAplysia sensory neuronsAction potentialsSensory neuronsIndicator dye fura-2Sensory neuron terminalsDye fura-2Modulation of Ca2Presynaptic inhibitionInhibitory transmitterNeuron terminalsPresynaptic facilitationCalcium influxFura-2Intracellular injectionIntracellular Ca2Transient riseInternal Ca2Time courseNeuronsFMRFamideCa2InfluxSerotonin