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The electrophysiological response to polarization-modulated patterned visual stimuli.

Stephen J Anderson1, Andrea Edson-Scott2, Gary P Misson3

  • 1School of Life & Health Sciences, Aston University, Birmingham B4 7ET, UK; Aston Neuroscience Institute, Aston University, Birmingham B4 7ET, UK.

Vision Research
|June 4, 2020
PubMed
Summary
This summary is machine-generated.

Humans can now have their visual polarization perception objectively measured. Polarization-modulated patterns elicit a visual evoked potential (VEP) response, indicating a new method for assessing foveal function.

Keywords:
Human visionMacular diseasePattern electroretinogramPolarized lightPrimate visionVisual evoked cortical potentials

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Area of Science:

  • Neuroscience
  • Vision Science
  • Electrophysiology

Background:

  • Human subjective polarization discrimination approaches that of invertebrates.
  • Electrophysiological responses to polarized light in humans are not well-established.

Purpose of the Study:

  • To objectively measure human electrophysiological responses to polarization-modulated visual stimuli.
  • To investigate the characteristics of visual evoked potential (VEP) and electroretinographic (ERG) responses to polarization patterns.

Main Methods:

  • Investigated VEP and ERG responses to checkerboard patterns modulated by polarization E-vector orientation (±45°).
  • Utilized a pattern-reversal protocol with standard check pattern sizes for clinical electrophysiology.
  • Controlled for luminance artefacts and tested wavelength dependency (>550 nm).

Main Results:

  • A significant visual evoked potential (VEP) response, termed PolVEP, was recorded (p < 0.01).
  • The PolVEP response showed a prominent positive component around 150 ms and negative components near 200 ms and 300 ms.
  • Responses were unrecordable at visible wavelengths >550 nm and negated by pseudo-depolarization; no ERG response was detected.

Conclusions:

  • Evoked cortical responses (PolVEP) offer an objective measure of human foveal function.
  • This method is potentially suitable for non-human primates with similar macular anatomy.
  • The findings highlight the role of polarization vision and its electrophysiological correlates.