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Related Experiment Videos

Inhibitory interhemispheric visuovisual interaction in motion perception.

Thomas Brandt1, Esther Marx, Thomas Stephan

  • 1Department of Neurology, Ludwig-Maximilians University, Klinikum Grosshadern, 81377 Munich, Germany. thomas.brandt@nro.med.uni-muenchen.de

Annals of the New York Academy of Sciences
|December 10, 2003
PubMed
Summary

Coherent motion stimulation in one visual field slows down motion perception in the other. This suggests visual system deactivation may reflect attentional shifts between hemispheres.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Functional magnetic resonance imaging (fMRI) studies show deactivations in visual areas during contralateral visual hemifield stimulation.
  • The functional significance of this contralateral inhibition in the visual system requires further investigation.

Purpose of the Study:

  • To determine the functional significance of contralateral inhibition in the visual system.
  • To investigate the relationship between visual system deactivation and motion perception.

Main Methods:

  • A psychophysical study involving 14 subjects.
  • Perception of single object motion in one visual hemifield, with and without concurrent motion stimulation in the contralateral hemifield.
  • Measurement of detection times for horizontal and vertical object motion.

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Main Results:

  • Mean detection times for both horizontal and vertical motion were significantly prolonged when concurrent motion stimulation was applied to the contralateral hemifield.
  • This indicates a functional decrement in motion perception sensitivity.

Conclusions:

  • The observed deactivation of neuronal activity in the visual system is associated with a functional decrement in motion perception.
  • These findings may reflect transcallosal attentional shifts between the brain hemispheres.