0000000000128962

AUTHOR

Annina Nolte

showing 3 related works from this author

Expectation of sensory stimulation modulates brain activation during visual motion stimulation.

2005

The differential effects of visual hemifield motion stimulation during fixation of a stationary target were compared under two conditions: fixation straight ahead without any further instructions and fixation straight ahead with attention shifted to the "dark hemifield." Data from nine right-handed volunteers revealed that striate and extrastriate right hemispheric visual areas exhibited larger activations during left hemifield motion stimulation when attention was shifted to the right dark hemifield. Montreal Neurological Institute (MNI) coordinates (26, -98, -4) of the additional clusters activated in the latter condition corresponded best to the kinetic occipital region, which is known t…

Brain activationAdultMalegenetic structuresModels NeurologicalMotion PerceptionStimulationFixation OcularNeural populationGeneral Biochemistry Genetics and Molecular BiologyFunctional LateralityHistory and Philosophy of ScienceReference ValuesPhysical StimulationHumansMotion perceptionCommunicationBrain MappingSensory stimulation therapybusiness.industryGeneral NeuroscienceBrainMiddle AgedVisual motionStraight aheadPositron-Emission TomographyFixation (visual)Visual PerceptionFemaleVisual FieldsPsychologybusinessNeurosciencePhotic StimulationAnnals of the New York Academy of Sciences
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Functional MRI of galvanic vestibular stimulation with alternating currents at different frequencies.

2004

Abstract Functional MRI was performed in 28 healthy volunteers to study the effects of galvanic vestibular stimulation with alternating currents (AC-GVS) of different frequencies on brain activation patterns. The aims of this study were (1) to identify specific areas within the vestibular cortical network that are involved in the processing of frequency-specific aspects by correlation analyses, (2) to determine the optimal frequency for stimulation of the vestibular system with respect to perception, and (3) to analyze whether different frequencies of AC-GVS are mediated in different cortical areas or different sites within the vestibular cortex. AC-GVS was performed using sinusoidal stimul…

AdultMalemedicine.medical_specialtyCognitive NeuroscienceMotion PerceptionStimulationAudiologySomatosensory systemSupramarginal gyrusmedicineImage Processing Computer-AssistedHumansGalvanic vestibular stimulationVestibular systemPhysicsCerebral CortexBrain Mappingmedicine.diagnostic_testVestibular cortexMagnetic Resonance ImagingElectric StimulationOxygenNeurologyCerebellar vermisFemaleVestibule LabyrinthNerve NetFunctional magnetic resonance imagingNeuroscienceAlgorithmsNeuroImage
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Eye closure in darkness animates sensory systems.

2003

Single subject and group analyses (n = 12) showed that the eyes-open and eyes-closed states in complete darkness considerably and consistently differ in the patterns of associated brain activation in fMRI. During nonchanging external stimulation, ocular motor and attentional systems were activated when the eyes were open; the visual, somatosensory, vestibular, and auditory systems were activated when the eyes were closed. These data suggest that there are two different states of mental activity: with the eyes closed, an "interoceptive" state characterized by imagination and multisensory activity and with the eyes open, an "exteroceptive" state characterized by attention and ocular motor act…

AdultMalegenetic structuresEye MovementsCognitive NeuroscienceSensory systemStimulationSomatosensory systemBrain mappingmedicineImage Processing Computer-AssistedHumansOcular Physiological PhenomenaOcular Physiological PhenomenaVestibular systemBrain Mappingmedicine.diagnostic_testElectronystagmographySomatosensory CortexDarknessMagnetic Resonance Imagingeye diseasesOxygenNeurologyElectronystagmographyDarknessFemalesense organsPsychologyNeuroscienceNeuroImage
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