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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...

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.

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Related Experiment Video

Updated: Nov 24, 2025

Eye Removal in Living Zebrafish Larvae to Examine Innervation-dependent Growth and Development of the Visual System

Eye Removal in Living Zebrafish Larvae to Examine Innervation-dependent Growth and Development of the Visual System

Published on: February 11, 2022

Neural circuitry for stimulus selection in the zebrafish visual system.

António M Fernandes¹, Duncan S Mearns², Joseph C Donovan¹

¹Department Genes-Circuits-Behavior, Max Planck Institute of Neurobiology, 82152 Martinsried, Germany.

|December 28, 2020

Summary

Larval zebrafish use distinct neural circuits for selective visual attention, employing winner-take-all (WTA) and averaging strategies based on stimulus presentation. These findings illuminate the brain mechanisms underlying visual stimulus selection.

Keywords:

behavioral choice isthmotectal nucleus isthmi parabigeminal nucleus retinotectal saliency stimulus selection visual system

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Related Experiment Videos

Last Updated: Nov 24, 2025

Eye Removal in Living Zebrafish Larvae to Examine Innervation-dependent Growth and Development of the Visual System

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Published on: February 11, 2022

Electroretinogram Analysis of the Visual Response in Zebrafish Larvae

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Published on: March 16, 2015

Ablation of a Neuronal Population Using a Two-photon Laser and Its Assessment Using Calcium Imaging and Behavioral Recording in Zebrafish Larvae

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Published on: June 2, 2018

Area of Science:

Neuroscience
Animal Behavior
Visual Processing

Background:

Animals must prioritize relevant environmental stimuli for effective navigation.
A theoretical framework for selective visual attention exists, but its neural circuit implementation is not well understood.

Purpose of the Study:

To investigate how larval zebrafish select between simultaneously presented visual stimuli.
To identify the neural circuits involved in selective visual attention.

Main Methods:

Behavioral experiments with larval zebrafish.
Analysis of neural activity patterns.
Optogenetic stimulation and laser ablation of specific neurons.

Main Results:

Behavioral responses were best simulated by a mix of winner-take-all (WTA) and averaging strategies.
Two circuits were identified whose activity predicts the relative saliencies of competing visual objects.
Monocular stimuli are selected by WTA in the inner retina; binocular stimuli involve nucleus isthmi (NI) and tectum interactions, leading to WTA or averaging.

Conclusions:

Selective visual attention in larval zebrafish relies on a combination of retinotectal and isthmotectal circuits.
The nucleus isthmi (NI) plays a crucial role in stimulus and action selection.
The specific circuit utilized depends on the spatial arrangement of competing visual stimuli.