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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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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

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Related Experiment Video

Updated: Jun 1, 2026

In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution

In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution

Published on: November 21, 2023

Visual experience-dependent maturation of correlated neuronal activity patterns in a developing visual system.

Heng Xu¹, Arseny S Khakhalin, Arto V Nurmikko

¹Department of Physics, Division of Engineering, Brown University, Providence, Rhode Island 02912, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|June 3, 2011

Summary

Neural circuit development requires visual experience for robust function. Visual input and NMDAR activation are critical for optimizing tectal network dynamics during development.

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Area of Science:

Neuroscience
Developmental Neuroscience
Systems Neuroscience

Background:

Neural circuits mature over development, optimizing responses to various inputs.
The role of neural experience versus hardwired elements in this optimization is unclear.

Purpose of the Study:

To investigate whether neural experience is required for the maturation of neural circuit function.
To examine the spatiotemporal response properties of developing tectal neurons in Xenopus laevis.

Main Methods:

In vivo calcium imaging of bulk-labeled neurons in the Xenopus laevis optic tectum.
Analysis of network activity dynamics in response to visual stimuli during development.

Main Results:

Tectal network activity becomes more robust, correlated, and synchronous during a critical developmental period.
These developmental changes necessitate normal visual input and are impaired by NMDAR blockade.

Conclusions:

Visual activity and NMDAR activation are essential for the maturation of tectal network dynamics.
Neural experience plays a critical role in the developmental optimization of visual system circuits.