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Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging
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Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging

Published on: July 11, 2025

Contrast gain control in natural scenes.

Peter J Bex1, Isabelle Mareschal, Steven C Dakin

  • 1Schepens Eye Research Institute, Harvard Medical School, Boston, MA 02114, USA. peter.bex@schepens.harvard.edu

Journal of Vision
|November 14, 2007
PubMed
Summary
This summary is machine-generated.

The human visual system processes natural scenes using narrowband filters, but requires adjustments for phase structure. Contrast gain control normalizes visual responses across uneven contrast distributions in natural scenes.

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Published on: March 10, 2011

Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Cortical visual processing models often use sine wave gratings.
  • These models propose narrowband local filters responding to contrast.
  • The applicability of these models to natural vision is questioned.

Purpose of the Study:

  • To investigate the human visual system's contrast response to natural scenes.
  • To determine if narrowband filtering applies to natural vision.
  • To explore the role of phase structure and gain control in natural scene processing.

Main Methods:

  • Examined contrast response functions of the human visual system.
  • Utilized natural scenes as visual stimuli.
  • Analyzed dependence on phase structure at different spatial scales.

Main Results:

  • Supported a narrowband approach to visual processing, with necessary modifications.
  • Found contrast response to natural scenes depends on phase structure across limited spatial regions.
  • Identified contrast gain control acting within cortical hypercolumns, not across them.

Conclusions:

  • Visual processing of natural scenes requires an elaborated narrowband model.
  • Contrast gain control normalizes visual system responses to uneven contrast distributions in natural scenes.
  • This normalization enhances visual perception of complex natural environments.