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Related Experiment Videos

The mechanisms for detecting compressively sampled gratings

S J Rainville1, F A Kingdom

  • 1McGill Vision Research Unit, Montréal, Québec, Canada. stephane@jiffy.vision.mcgill.ca

Vision Research
|January 13, 1998
PubMed
Summary

Compressively sampled gratings (CSGs) show altered contrast thresholds. Contrary to prior hypotheses, this study indicates that bar contrast, not luminance, influences detection, suggesting dynamic gain control mechanisms are involved in visual perception.

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Area of Science:

  • Visual neuroscience
  • Perceptual psychology

Background:

  • Compressively sampled gratings (CSGs) are used to study visual perception.
  • Previous research suggested localized luminance adaptation explains threshold elevations in CSGs.

Purpose of the Study:

  • To investigate the mechanisms underlying contrast threshold changes in increment-bar CSGs.
  • To test the validity of the localized luminance adaptation hypothesis.

Main Methods:

  • Experiments using increment-bar CSGs with varying background luminance.
  • Investigating the effect of unsampled grating pedestals.
  • Measuring thresholds when the grating fundamental was cancelled.

Main Results:

  • Raising background luminance significantly reduced thresholds for increment-bar CSGs.

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  • CSG detection was facilitated by pedestals and impaired by fundamental cancellation.
  • Evidence for a dynamic gain control component in increment-bar CSG detection was found.

    • Conclusions:

    • The localized luminance adaptation hypothesis is untenable for increment-bar CSGs.
    • Contrast, rather than luminance, of sampled bars is critical for CSG detection.
    • CSGs are likely detected by the same visual mechanisms as unsampled gratings.