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Related Concept Videos

Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Related Experiment Video

Updated: Jun 20, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
08:42

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

Published on: February 8, 2020

Inter-ocular contrast normalization in human visual cortex.

Farshad Moradi1, David J Heeger

  • 1Department of Psychology and Center for Neural Science, New York University, New York, NY, USA. farshadm@caltech.edu

Journal of Vision
|September 18, 2009
PubMed
Summary
This summary is machine-generated.

Brain visual processing combines inputs from both eyes. A normalization model explains binocular responses, showing how visual cortex integrates differing stimuli, especially with contrast normalization.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • The brain integrates visual input from two eyes into a unified perception.
  • Mechanisms of binocular visual information combination in the visual cortex remain unclear.

Purpose of the Study:

  • To investigate how the visual cortex combines monocular inputs, particularly under varying contrast conditions.
  • To test models of binocular interaction, including linear summation and contrast normalization.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) to measure brain activity.
  • Monocular and dichoptic presentation of gratings with same or orthogonal orientations.
  • Observers performed a demanding fixation task to minimize top-down influences.

Main Results:

  • Dichoptic presentation of same-orientation gratings yielded increased activity only at low contrasts (<10%).
  • A binocular contrast normalization model accurately predicted responses, outperforming linear summation models.
  • Orthogonal gratings showed suppression, with activity levels similar to monocular stimuli, unaffected by onset asynchrony.

Conclusions:

  • Binocular responses are well-explained by a normalization model where each eye's input modulates the other's gain.
  • Inter-ocular suppression in V1 (primary visual cortex) is influenced by orientation compatibility and contrast.
  • Cross-orientation suppression is weaker than inter-ocular suppression between same-oriented stimuli.