6533b7ddfe1ef96bd1273eb1
RESEARCH PRODUCT
Inhibitory interhemispheric visuovisual interaction in motion perception.
Sandra BenseThomas BrandtEsther MarxThomas StephanMarianne Dieterichsubject
AdultMalegenetic structuresMotion PerceptionStimulationLateral geniculate nucleusGeneral Biochemistry Genetics and Molecular BiologyHistory and Philosophy of SciencemedicinePsychophysicsPsychophysicsPremovement neuronal activityHumansMotion perceptionVisual Cortexmedicine.diagnostic_testGeneral NeuroscienceGeniculate BodiesMagnetic resonance imagingMiddle AgedMagnetic Resonance ImagingVisual cortexmedicine.anatomical_structureFemalePsychologyFunctional magnetic resonance imagingNeuroscienceCognitive psychologydescription
Findings of an earlier functional magnetic resonance imaging (fMRI) study that coherent motion stimulation of the right or left visual hemifield exhibited negative signal changes (deactivations) in the primary visual cortex and the lateral geniculate nucleus contralateral to the stimulated hemisphere were evaluated to determine the functional significance of this contralateral inhibition of the visual system. Fourteen subjects participated in a psychophysical study on the perception of single object motion (0.4 degrees /s) in one visual hemifield with or without concurrent coherent motion stimulation of the contralateral hemifield. Mean detection times for horizontal object motion (0.5 +/- 0.19 vs. 0.61 +/- 0.22 s) and vertical object motion (0.53 +/- 0.19 vs. 0.72 +/- 0.34 s) were significantly prolonged during concurrent motion pattern stimulation in the contralateral hemifield. These data support the interpretation that the deactivation of neuronal activity in the visual system found by fMRI is associated with a functional decrement in the sensitivity needed to perceive motion and may reflect transcallosal attentional shifts between the two hemispheres.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-10-01 | Annals of the New York Academy of Sciences |