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Related Experiment Videos

Interaction between sub- and supra-Nyquist spatial frequencies in peripheral vision

Y Z Wang1, A Bradley, L N Thibos

  • 1Visual Sciences Group, School of Optometry, Indiana University, Bloomington 47405, USA. yizwang@astra.vision.mcgill.ca

Vision Research
|November 28, 1997
PubMed
Summary

Supra-Nyquist gratings, even when barely visible, can significantly mask the detection of sub-Nyquist gratings in peripheral vision. This suggests masking occurs after spatial sampling, challenging previous findings.

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Area of Science:

  • Visual Neuroscience
  • Perception Psychology

Background:

  • High-frequency gratings beyond the Nyquist limit cause aliasing in peripheral vision.
  • Previous studies showed sub-Nyquist gratings can mask supra-Nyquist gratings.

Purpose of the Study:

  • To investigate if supra-Nyquist gratings can mask the contrast detection of sub-Nyquist gratings in peripheral vision.
  • To explore the conditions under which such masking occurs.

Main Methods:

  • Employed a temporal three-alternative, forced-choice (3AFC) masking paradigm.
  • Used compound gratings with varying supra-Nyquist and sub-Nyquist components.

Main Results:

  • High-frequency, aliased gratings (supra-Nyquist) with contrast just 2-3 times above threshold powerfully masked low-frequency, resolved gratings (sub-Nyquist).

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  • This masking effect was stronger than previously reported for similar paradigms.

    • Conclusions:

    • Supra-Nyquist gratings can effectively mask sub-Nyquist gratings in peripheral vision.
    • The findings support an irregular sampling model and suggest masking occurs post-spatial sampling.