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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.

Neural Circuits

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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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.
Once through the pupil, the light passes through the lens, a...

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Related Experiment Video

Updated: Mar 14, 2026

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping

Published on: December 8, 2023

Circuits for presaccadic visual remapping.

Hrishikesh M Rao¹, J Patrick Mayo², Marc A Sommer^3,2,4

¹Department of Biomedical Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina; hri.rao@gmail.com.

Journal of Neurophysiology

|September 23, 2016

Summary

This summary is machine-generated.

Visual system neurons remap receptive fields before saccadic eye movements, requiring corollary discharge. This presaccadic remapping, studied in the frontal eye field (FEF), aids perception continuity.

Keywords:

eye movements perception remapping saccades vision

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Area of Science:

Neuroscience
Visual System Function
Oculomotor Control

Background:

Saccadic eye movements alter retinal image projection.
Presaccadic receptive field shifts, termed remapping, occur in visual neurons.
Remapping is crucial for maintaining visual continuity during eye movements.

Purpose of the Study:

To review recent progress in understanding neural circuits for remapping.
To explore hypotheses explaining variations in remapping across brain areas.
To investigate the role of the frontal eye field (FEF) in remapping.

Main Methods:

Analysis of neurons in corollary discharge pathways targeting the FEF.
Review of studies employing reversible inactivation, neural recording, and modeling.
Examination of evidence for remapping's contribution to transsaccadic continuity.

Main Results:

Evidence suggests remapping may be assembled within the FEF's local microcircuitry.
Remapping is implicated in maintaining continuity of action and perception across saccades.
Multiple forms of remapping exist, with reasons for differences still under investigation.

Conclusions:

The FEF plays a significant role in the neural basis of remapping.
Further research is needed to elucidate the functional diversity of remapping circuits.
Three hypotheses are proposed to guide future investigations into remapping mechanisms.