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Related Experiment Videos

Automatic perimetry and visual P300: differences between upper and lower visual fields stimulation in healthy

M Fioretto1, E Gandolfo, C Orione

  • 1Department of Motor Science, University of Genoa, Italy.

Journal of Medical Engineering & Technology
|March 1, 1995
PubMed
Summary

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Human visual-evoked potentials (VEPs) show higher amplitudes and lower sensitivity thresholds in the lower visual hemifield compared to the upper. This suggests interactions between visual perception and cognitive functions.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Human visual-evoked potentials (VEPs) are used to study visual pathways.
  • Previous studies on cortical generators of hemifield stimulation show conflicting results.
  • Differences between hemiretinas and visual pathways are thought to influence VEPs.

Purpose of the Study:

  • To compare visual sensitivity thresholds and VEP/P3 amplitudes between the lower and upper hemifields.
  • To investigate the relationship between visual processing and cognitive function.
  • To reconcile conflicting topographic studies on VEP generators.

Main Methods:

  • 12 healthy subjects underwent automatic perimetry to assess retinal sensitivity thresholds.
  • Visual-evoked potentials (VEPs) and P3 event-related potentials (ERPs) were recorded using an odd-ball paradigm with checkerboard stimuli.

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  • Stimulation was delivered at 20 degrees eccentricity in both upper and lower hemifields.

    • Main Results:

    • Lower sensitivity thresholds were observed in the lower visual hemifield compared to the upper.
    • Higher VEP and P3 (ERP) amplitudes were recorded during lower hemifield stimulation.
    • Results align with existing anatomical and physiological evidence.

    Conclusions:

    • The lower visual hemifield exhibits enhanced visual processing and cognitive response compared to the upper.
    • Interactions between visual perceptive processes and higher cognitive functions may explain these differences.
    • Findings support distinct functional characteristics of the hemiretinas and visual pathways.