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Visual Field Asymmetries in Responses to ON and OFF Pathway Biasing Stimuli.

Martin Timothy Wilkinson Scott1, Alexandra Yakovleva2, Anthony Matthew Norcia1

  • 1Stanford University, Department of Psychology Stanford, CA, USA.

Visual Neuroscience
|December 19, 2024
PubMed
Summary

The ON and OFF visual pathways show different responses across the visual field. Understanding these differences is key for diagnosing vision loss conditions like glaucoma.

Keywords:
ON/OFF pathwaysluminance contrastsawtooth stimulivisual evoked potentialvisual fields

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Area of Science:

  • Neuroscience
  • Vision Science
  • Ophthalmology

Background:

  • Glaucoma may selectively impact ON and OFF visual pathways.
  • Perimetric assessment of these pathways could aid glaucoma diagnosis.
  • Understanding normal ON/OFF pathway function across visual fields and intensities is crucial.

Purpose of the Study:

  • To measure ON- and OFF-pathway biased contrast response functions in the upper and lower visual fields.
  • To investigate how visual field location and contrast intensity affect ON/OFF pathway function.

Main Methods:

  • Electroencephalography (EEG) was used to measure neural responses.
  • A steady-state visually evoked potential (SSVEP) paradigm with flickering luminance probes was employed.
  • Frequency tagging differentiated responses from the upper (3.75 Hz) and lower (3 Hz) visual fields.

Main Results:

  • OFF-pathway responses (visual decrements) were larger than ON-pathway responses (visual increments), particularly in the lower visual field.
  • Both ON and OFF responses followed sigmoidal non-linearity in the lower visual field.
  • In the upper visual field, ON responses were similar to the lower field, but OFF responses showed less saturation and higher variability.

Conclusions:

  • The relationship between ON and OFF visual pathways varies with visual field location and contrast level.
  • These findings may reflect natural scene statistics and have implications for understanding visual processing and disease.
  • This research provides a foundation for using perimetric assessment of ON/OFF pathways in diagnosing vision loss.