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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Configuration specificity of crowding in peripheral vision.

Nisha S Yeotikar1, Sieu K Khuu, Lisa J Asper

  • 1School of Optometry & Vision Science, University of New South Wales, Sydney, NSW 2052, Australia. n.yeotikar@unsw.edu.au

Vision Research
|April 5, 2011
PubMed
Summary

Peripheral crowding, or impaired vision with surrounding elements, is configuration-specific. Flanker parameters, not just separation, significantly impact crowding in orientation and contrast tasks.

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Area of Science:

  • Visual neuroscience
  • Perception psychology

Background:

  • Peripheral vision exhibits reduced spatial resolution and performance, a phenomenon known as crowding.
  • Crowding's dependence on target-flanker separation is well-established, but the role of flanker parameters alone is less understood.

Purpose of the Study:

  • To investigate how flanking stimulus parameters influence crowding in peripheral orientation and contrast discrimination.
  • To elucidate the underlying mechanisms of crowding in peripheral vision.

Main Methods:

  • Utilized closely spaced "chain" lateral Gabor stimuli in orientation and contrast discrimination tasks.
  • Manipulated flanker parameters to assess their independent effect on crowding.

Main Results:

  • Crowding demonstrated a strong configural effect, decreasing when flankers enhanced target salience and increasing when flankers were perceptually grouped with the target.
  • Orientation discrimination crowding depended on eccentricity; contrast discrimination crowding depended on flanker contrast and eccentricity.
  • Crowding showed minimal dependence on the number of flankers in both tasks.

Conclusions:

  • Crowding in peripheral vision is configuration-specific and can be modulated by flanker parameters without changing target-flanker separation.
  • Crowding involves a combination of low-level and high-level cortical processing.