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Spatial frequency adaptation and contrast gain control

H R Wilson1, R Humanski

  • 1Visual Sciences Center, University of Chicago, IL 60637.

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

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Spatial frequency adaptation reduces contrast sensitivity and is not due to neuronal fatigue. Instead, it involves a contrast gain control network with modified feedback, explaining threshold changes and aftereffects.

Area of Science:

  • Visual perception
  • Neuroscience
  • Computational modeling

Background:

  • Spatial frequency adaptation affects contrast increment thresholds.
  • Previous explanations focused on neuronal fatigue.

Purpose of the Study:

  • Investigate the mechanisms of spatial frequency adaptation.
  • Determine if adaptation results from neuronal fatigue.
  • Propose an alternative model based on contrast gain control.

Main Methods:

  • Measured contrast increment thresholds after spatial frequency adaptation.
  • Varied test duration (30 ms and 500 ms).
  • Conducted control experiments to rule out specific neural mechanisms.
  • Developed and tested a computational network model.

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Main Results:

  • Adaptation decreased the exponent of the power law for contrast thresholds.
  • Threshold elevation was minimal at 30 ms but significant at 500 ms.
  • Results ruled out sustained and transient mechanism explanations.
  • A contrast gain control network model successfully explained the data.

Conclusions:

  • Spatial frequency adaptation is not caused by neuronal fatigue.
  • Adaptation likely involves increased divisive feedback in a contrast gain control network.
  • The model predicts adaptation magnitude and temporal dependence, including aftereffects.