Search results for "motor evoked potentials"

showing 5 items of 5 documents

Increased facilitation of the primary motor cortex following 1 Hz repetitive transcranial magnetic stimulation of the contralateral cerebellum in nor…

2005

Connections between the cerebellum and the contralateral motor cortex are dense and important, but their physiological significance is difficult to measure in humans. We have studied a group of 10 healthy subjects to test whether a modulation of the excitability of the left cerebellum can affect the excitability of the contralateral motor cortex. We used repetitive transcranial magnetic stimulation (rTMS) at 1 Hz frequency to transiently depress the excitability of the left cerebellar cortex and paired-pulse TMS testing of intracortical inhibition (ICI) and intracortical facilitation (ICF) to probe the excitability of cortico-cortical connections in the right motor cortex. The cortical sile…

AdultMaleCerebellumTMS Cerebellum Motor cortex Motor evoked potentialsmedicine.medical_treatmentbehavioral disciplines and activitiesSynaptic TransmissionMotor evoked potentialsFunctional LateralityNOCerebellar CortexPurkinje CellsCerebellum; Motor cortex; Motor evoked potentials; TMS;Reference ValuesCerebellumNeural PathwaysmedicineReaction TimeHumansEvoked PotentialsSettore M-PSI/02 - Psicobiologia E Psicologia Fisiologicamusculoskeletal neural and ocular physiologyGeneral NeuroscienceInterstimulus intervalMotor CortexNeural InhibitionEvoked Potentials MotorTranscranial Magnetic StimulationElectric StimulationTranscranial magnetic stimulationElectrophysiologyReference Values; Humans; Cerebellum; Neural Inhibition; Electric Stimulation; Cerebellar Cortex; Purkinje Cells; Motor Cortex; Evoked Potentials Motor; Adult; Neural Pathways; Transcranial Magnetic Stimulation; Synaptic Transmission; Female; Functional Laterality; Male; Reaction Time; Cerebellar Nucleimedicine.anatomical_structurenervous systemMotorCerebellar NucleiTMSCerebellar cortexSilent periodSettore MED/26 - NeurologiaFemalePrimary motor cortexPsychologyNeurosciencepsychological phenomena and processesMotor cortexNeuroscience letters
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Effects of muscle action type on corticospinal excitability and triceps surae muscle-tendon mechanics.

2018

This study investigated whether the specific motor control strategy reported for eccentric muscle actions is dependent on muscle mechanical behavior. Motor evoked potentials, Hoffman reflex (H-reflex), fascicle length, pennation angle, and fascicle velocity of soleus muscle were compared between isometric and two eccentric conditions. Ten volunteers performed maximal plantarflexion trials in isometric, slow eccentric (25°/s), and fast eccentric (100°/s) conditions, each in a different randomized testing session. H-reflex normalized by the preceding M wave (H/M) was depressed in both eccentric conditions compared with isometric ( P < 0.001), while no differences in fascicle length and pe…

AdultMalePhysiologyPyramidal TractsH-ReflexTendons03 medical and health sciences0302 clinical medicineMuscle actionTriceps surae muscleIsometric ContractionMedicineEccentricHumansta315Muscle Skeletalbusiness.industryGeneral NeuroscienceMotor control030229 sport sciencesTendonBiomechanical Phenomenamedicine.anatomical_structurecorticospinal excitabilitymotor evoked potentialsbusinessNeuroscience030217 neurology & neurosurgerymuscle-tendon dynamicsJournal of neurophysiology
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Multimodal Intraoperative Neuromonitoring in Aneurysm Surgery

2017

Following aneurysmal subarachnoid hemorrhage, the primary goal of treatment is to exclude the vascular malformation from the intracranial circulation, while preserving the parent artery. In unruptured aneurysms, the decision whether to treat or observe the malformation is made on a case-by-case basis. In this regard, the ISUIA (International Study of Unruptured Intracranial Aneurysms) investigators suggested that aneurysm size and location were independent predictors for aneurysm rupture.1 ISUIA examined 1692 patients with cerebral aneurysms with a mean follow-up time of 4.1 years. Rupture rates differed depending on size and location, ranging from 0% in aneurysms <7 mm located in the in…

International Subarachnoid Aneurysm Trialmedicine.medical_specialtyMonitoringSomatosensoryPostoperative deficits03 medical and health sciences0302 clinical medicineAneurysmmedicineHumansCerebral aneurysms; Intraoperative monitoring; Postoperative deficits; Somatosensory evoked potentials; Transcranial motor evoked potentials; Aneurysm; Humans; Monitoring Intraoperative; Evoked Potentials Motor; Evoked Potentials Somatosensory; Surgery; Neurology (clinical)Cerebral aneurysmsEvoked PotentialsIntraoperative monitoringSomatosensory evoked potentialsIntraoperativebusiness.industryMultimodal Intraoperative Neuromonitoring in Aneurysm Surgerymedicine.diseaseAneurysmSurgeryCerebral aneurysms Intraoperative monitoring Postoperative deficits Somatosensory evoked potentials Transcranial motor evoked potentialsMotorSomatosensory evoked potential030220 oncology & carcinogenesisAnesthesiaAneurysm surgerySurgeryNeurology (clinical)businessTranscranial motor evoked potentials030217 neurology & neurosurgery
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Effects of low-gamma tACS on primary motor cortex in implicit motor learning

2019

Abstract In the primary motor cortex (M1), rhythmic activity in the gamma frequency band has been found during movement planning, onset and execution. Although the role of high-gamma oscillatory activity in M1 is well established, the contribution of low-gamma activity is still unexplored. In this study, transcranial alternating current stimulation (tACS) was used with the aim to specifically modulate low-gamma frequency band in M1, during an implicit motor learning task. A 40 Hz-tACS was applied over the left M1 while participants performed a serial reaction time task (SRTT) using their right hand. The task required the repetitive execution of sequential movements in response to sequences …

Serial reaction timeAdultMaleComputer scienceMotor learningmedicine.medical_treatmentMovementPrimary motor cortexInterference theoryMotor ActivityTranscranial Direct Current StimulationGamma oscillation03 medical and health sciencesBehavioral Neuroscience0302 clinical medicinemedicineReaction TimeGamma RhythmHumansLearning030304 developmental biologyTranscranial alternating current stimulationMotor Evoked Potentials (MEP)0303 health sciencesSettore M-PSI/02 - Psicobiologia E Psicologia FisiologicaMotor Cortextranscranial Alternating Current Stimulation (tACS)Evoked Potentials MotorRandom sequenceHealthy VolunteersTranscranial magnetic stimulationSerial reaction time task (SRTT)FemaleSequence learningPrimary motor cortexMotor learningNeuroscience030217 neurology & neurosurgeryPsychomotor Performance
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Individualized Template MRI Is a Valid and Reliable Alternative to Individual MRI for Spatial Tracking in Navigated TMS Studies in Healthy Subjects

2020

Objectives: Navigated transcranial magnetic stimulation (nTMS) provides significant benefits over classic TMS. Yet, the acquisition of individual structural magnetic resonance images (MRIindividual) is a time-consuming, expensive, and not feasible prerequisite in all subjects for spatial tracking and anatomical guidance in nTMS studies. We hypothesize that spatial transformation can be used to adjust MRI templates to individual head shapes (MRIwarped) and that TMS parameters do not differ between nTMS using MRIindividual or MRIwarped.Materials and Methods: Twenty identical TMS sessions, each including four different navigation conditions, were conducted in 10 healthy subjects (one female, 2…

primary motor cortextranscranial magnetic stimulationtemplate magnetic resonance imagesspatial transformationmotor evoked potentialsnavigationlcsh:Neurosciences. Biological psychiatry. Neuropsychiatrylcsh:RC321-571Frontiers in Human Neuroscience
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