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Related Experiment Videos

Contrast gain control in psychophysical contrast discrimination

J L Dannemiller1, B R Stephens

  • 1Department of Psychology, University of Wisconsin, Madison 53706, USA. jldannem@facstaff.wisc.edu

Perception & Psychophysics
|November 20, 1998
PubMed
Summary

Visual masking interferes with contrast discrimination by disrupting temporal averaging in contrast gain control. This suggests these visual system mechanisms average contrast over periods longer than 62.5 milliseconds.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Computational vision

Background:

  • Contrast masking is a phenomenon in visual perception.
  • It may involve contrast gain control mechanisms within the visual system.
  • Understanding these mechanisms is crucial for visual neuroscience.

Purpose of the Study:

  • To investigate the role of contrast gain control in contrast masking.
  • To examine how interrupting base contrast affects contrast discrimination.
  • To determine the temporal characteristics of contrast gain control networks.

Main Methods:

  • Four experiments were conducted using contrast masking paradigms.
  • Base contrast gratings were interrupted with various maskers (uniform field, phase-shifted grating, higher contrast grating) at 8 Hz.

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  • Contrast discrimination performance was measured under these conditions.

    • Main Results:

    • Interruption of base contrast significantly interfered with contrast discrimination.
    • These masking effects were observed only when background contrast exceeded its threshold.
    • The degree of interference depended on the masker type and base contrast level.

    Conclusions:

    • Contrast gain control networks appear to operate via temporal averaging of contrast.
    • The temporal averaging window is estimated to be greater than 62.5 milliseconds.
    • Discrepancies between time-averaged and base contrast impair contrast discrimination.