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Serial spatial filters in vision

B Chen1, W Makous, D R Williams

  • 1Center for Visual Science, University of Rochester, NY 14627.

Vision Research
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Viewing superimposed laser fringes creates an illusory grating due to visual system nonlinear distortion. This study decomposes contrast sensitivity, locating this nonlinear process within the retina.

Area of Science:

  • Vision science
  • Visual perception
  • Retinal processing

Background:

  • Observers perceive illusory gratings from superimposed laser interference fringes, even beyond resolution limits.
  • This phenomenon arises from nonlinear distortion within the visual system.
  • Previous research suggests nonlinear distortion plays a role in visual perception.

Purpose of the Study:

  • To decompose the contrast sensitivity function into components separated by a nonlinear process.
  • To investigate the location and characteristics of the nonlinear distortion in the visual system.
  • To understand the role of individual cone photoreceptors in early visual processing.

Main Methods:

  • Utilizing laser interferometry to bypass optical losses in the eye.

Related Experiment Videos

  • Manipulating spatial frequencies of interference fringes and distortion gratings.
  • Measuring spatial summation and antagonism at different retinal eccentricities.

    • Main Results:

    • Spatial summation preceding the nonlinear stage is proportional to cone inner segment diameters, suggesting light trapping within cones.
    • The nonlinear stage occurs before the convergence of signals from individual cones, indicating a retinal location.
    • Spatial antagonism precedes the nonlinear stage, placing it after the cone outer segments.
    • Dichoptic presentation did not produce illusory gratings, highlighting the monocular nature of the nonlinearity.

    Conclusions:

    • The nonlinear process responsible for illusory gratings is located within the retina, likely after the cone outer segments.
    • Individual cone inner segments play a role in spatial summation before the nonlinear stage.
    • The visual system's nonlinear distortion is a monocular process, not originating in the binocular pathway.