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Vision

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.

Visual System

Visual System

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.
Once through the pupil, the light passes through the lens, a...

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Related Experiment Video

Updated: Jun 17, 2026

Video-oculography in Mice

Video-oculography in Mice

Published on: July 19, 2012

A projection specific logic to sampling visual inputs in mouse superior colliculus.

Katja Reinhard^1,2,3, Chen Li^1,2,3, Quan Do^1,4

¹Neuro-Electronics Research Flanders, Leuven, Belgium.

|November 22, 2019

Summary

This summary is machine-generated.

The superior colliculus precisely routes distinct retinal inputs to specific brain targets, enabling innate behaviors. This projection-specific sampling ensures visual information selectively triggers appropriate behavioral responses.

Keywords:

mouse neuroscience parabigeminal nucleus pulvinar retina superior colliculus visual circuits

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Area of Science:

Neuroscience
Visual processing
Circuitry

Background:

Behavioral responses are triggered by sensory information processed through neural circuits.
The superior colliculus integrates visual input from numerous retinal ganglion cell types to mediate innate behaviors.
Understanding how parallel visual inputs are routed to downstream targets is crucial but remains poorly understood.

Purpose of the Study:

To investigate the projection-specific logic of retinal input sampling by the superior colliculus.
To determine how distinct retinal ganglion cell types are routed to downstream targets like the pulvinar and parabigeminal nucleus.
To elucidate the relationship between retinal input properties and their downstream targets in behavior initiation.

Main Methods:

Transsynaptic circuit tracing to map connections.
In vivo and ex vivo electrophysiological recordings to analyze neural activity.
Analysis of retinal ganglion cell types and their projection targets within the superior colliculus.

Main Results:

A projection-specific routing logic was identified, where distinct output pathways of the superior colliculus sample unique sets of retinal inputs.
Neurons projecting to the pulvinar or parabigeminal nucleus showed biased sampling of specific retinal ganglion cell types.
Visual response properties of retinal ganglion cells correlated with those of their disynaptic targets, indicating functional specificity.

Conclusions:

The superior colliculus employs projection-specific sampling of retinal inputs.
This selective routing mechanism may form the basis for triggering specific innate behaviors.
Findings provide insights into how visual information is processed for behavioral output.