0000000000482262

AUTHOR

Klaus Seelos

showing 2 related works from this author

Functional Magnetic Resonance Imaging Activations of Cortical Eye Fields during Saccades, Smooth Pursuit, and Optokinetic Nystagmus

2009

Saccades, smooth pursuit, and optokinetic nystagmus (OKN) are three basic eye movements in our ocular motor repertoire that enable us to explore the visual field. These eye movements are cortically controlled in different cortical eye fields, including the frontal eye fields (FEF) and parietal eye fields (PEF), as well as the motion-sensitive visual area MT+/V5. It is not known if this cortical control is organized in parallel cortico-cortical networks or in adjacent subregions of one system. Nor do we know where the specific eye fields are exactly located. Functional magnetic resonance imaging (fMRI) was used to investigate these open questions about the FEF, PEF, and MT+/V5. Activations o…

AdultMalegenetic structuresGeneral Biochemistry Genetics and Molecular BiologySmooth pursuitHistory and Philosophy of ScienceCortex (anatomy)SaccadesmedicineHumansAgedmedicine.diagnostic_testGeneral NeuroscienceEye movementOptokinetic reflexMiddle AgedFrontal eye fieldsMagnetic Resonance Imagingeye diseasesParietal eyeVisual fieldmedicine.anatomical_structureFemalesense organsVisual FieldsFunctional magnetic resonance imagingPsychologyNeuroscienceAnnals of the New York Academy of Sciences
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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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