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Related Experiment Video

Updated: Jun 29, 2026

Visual Evoked Potential Recording in a Rat Model of Experimental Optic Nerve Demyelination
06:49

Visual Evoked Potential Recording in a Rat Model of Experimental Optic Nerve Demyelination

Published on: July 29, 2015

Pattern-onset stimulation boosts central multifocal VEP responses.

Michael B Hoffmann1, Sirko Straube, Michael Bach

  • 1Visual Processing Lab, Universitäts-Augenklinik, Freiburg, Germany. hoffmann@aug.ukl.uni-freiburg.de

Journal of Vision
|August 7, 2003
PubMed
Summary
This summary is machine-generated.

Pattern-onset stimulation enhances central visual field assessment using multifocal visual evoked potentials (mfVEP). Combining pattern-onset and pattern-reversal stimuli reduces false positives in objective visual field perimetry.

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Related Experiment Videos

Last Updated: Jun 29, 2026

Visual Evoked Potential Recording in a Rat Model of Experimental Optic Nerve Demyelination
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Published on: July 29, 2015

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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
09:42

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns

Published on: May 12, 2019

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Electrophysiology

Background:

  • Multifocal visual evoked potentials (mfVEP) offer objective visual field perimetry by assessing cortical activity.
  • Subject-specific cortical folding can cause signal dropout, leading to false positives for scotomata in mfVEP.
  • Optimizing mfVEP stimulation is crucial for accurate visual field assessment.

Purpose of the Study:

  • To compare pattern-reversal and pattern-onset stimulation for activating the visual cortex in mfVEP.
  • To evaluate the efficacy of these stimuli in objective visual field perimetry.
  • To reduce false positives in mfVEP testing.

Main Methods:

  • Recorded mfVEP responses to 60 visual field locations (44-degree diameter) using both pattern-reversal and pattern-onset stimuli.
  • Compared amplitude enhancement and eccentricity dependence between the two stimulation types.
  • Assessed the combined effect of both stimuli on reducing false positives.

Main Results:

  • Pattern-onset stimulation enhanced central visual field responses ( <10 degrees radius) by 30% but reduced peripheral responses (>15 degrees) by 30% compared to pattern-reversal.
  • Both stimulation types showed similar topographical distributions despite differing eccentricity-dependent responses.
  • Combining pattern-onset and pattern-reversal stimuli reduced false positives to less than 1.5% of tested locations.

Conclusions:

  • Pattern-onset and pattern-reversal stimuli activate the same visual cortical areas but engage distinct neural mechanisms.
  • Pattern-onset stimulation significantly improves mfVEP sensitivity for the central 10 degrees of the visual field.
  • Combining both stimulation methods enhances the reliability of objective visual field perimetry by minimizing false positives.