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Related Experiment Videos

Direction-dependent visual cortex activation during horizontal optokinetic stimulation (fMRI study).

Sandra Bense1, Barbara Janusch, Peter Schlindwein

  • 1Department of Neurology, Johannes-Gutenberg University, Mainz, Germany. bense@neurologie.klinik.uni-mainz.de

Human Brain Mapping
|August 5, 2005
PubMed
Summary

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Optokinetic nystagmus (OKN) involves visual cortex activation. This study found no direction-dependent differences in cortical eye fields, suggesting bilateral processing of eye movements.

Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Ophthalmology

Background:

  • Optokinetic nystagmus (OKN) is a reflex eye movement triggered by visual motion.
  • OKN engages multiple visual and ocular motor cortical areas, including the motion-sensitive area MT/V5 and eye fields.

Purpose of the Study:

  • To investigate stimulus direction-dependent effects in cortical eye fields during OKN.
  • To determine if hemispheric dominance exists in ocular motor areas during OKN.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 15 healthy subjects.
  • Optokinetic nystagmus (OKN) was elicited in rightward and leftward directions.
  • Brain activity was compared between OKN conditions and a stationary target control.

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Main Results:

  • No significant direction-dependent differences were observed in cortical eye fields.
  • Asymmetrical activation was noted in paramedian visual cortex areas.
  • Stronger activation occurred in the hemisphere contralateral to the slow OKN phase (pursuit).

Conclusions:

  • The processing of horizontal eye movements in both directions appears to be mediated by the same cortical ocular motor areas.
  • No hemispheric dominance for OKN processing was found in right-handed volunteers.
  • Asymmetrical visual cortex stimulation may result from gaze shifts during OKN.