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Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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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.

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Related Experiment Video

Updated: May 10, 2026

Quantification of Visual Feature Selectivity of the Optokinetic Reflex in Mice

Quantification of Visual Feature Selectivity of the Optokinetic Reflex in Mice

Published on: June 23, 2023

Sublinear binocular integration preserves orientation selectivity in mouse visual cortex.

Xinyu Zhao¹, Mingna Liu, Jianhua Cang

¹Department of Neurobiology, Northwestern University, Evanston, Illinois 60208, USA.

Nature Communications

|June 27, 2013

Summary

This summary is machine-generated.

Mouse visual cortical simple cells maintain orientation selectivity under both monocular and binocular vision. Sublinear integration of inputs, promoted by inhibition, preserves this selectivity, allowing seamless switching between visual conditions.

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Area of Science:

Neuroscience
Visual processing
Sensory integration

Background:

Visual cortical neurons must process information from one (monocular) or both (binocular) eyes.
Simple cells in the primary visual cortex integrate inputs from both eyes.

Purpose of the Study:

To investigate how mouse visual cortical simple cells maintain orientation selectivity under both monocular and binocular conditions.
To elucidate the cellular mechanisms underlying binocular integration in visual neurons.

Main Methods:

In vivo whole-cell recordings in anaesthetized and awake mice.
Computational simulations of synaptic conductances.
Genetic and pharmacological manipulations.

Main Results:

Binocular orientation selectivity closely matches monocular selectivity in mouse simple cells.
Binocular integration of membrane potential responses is sublinear.
Sublinear integration prevents depolarizations at non-preferred orientations, preserving selectivity.

Conclusions:

Inhibition promotes sublinear binocular integration, a key mechanism for maintaining orientation selectivity.
This cellular mechanism enables the visual system to switch effortlessly between monocular and binocular processing.
The findings suggest a potentially conserved mechanism across different sensory systems that integrate multiple input channels.