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Parallel Processing

Parallel Processing

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...

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...

Depth Perception and Spatial Vision

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

Color Vision

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: Dec 24, 2025

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Two stream hypothesis of visual processing for navigation in mouse.

Aman B Saleem¹

¹UCL Institute of Behavioural Neurosciences, Department of Experimental Psychology, University College London, London, WC1H 0AP, UK.

Current Opinion in Neurobiology

|April 16, 2020

Summary

This summary is machine-generated.

Vision research is shifting from stationary observation to active navigation. Spatial context significantly impacts visual cortex responses, suggesting distinct processing streams for landmark and self-motion cues based on visual field coverage.

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Related Experiment Videos

Last Updated: Dec 24, 2025

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Integrating Visual Psychophysical Assays within a Y-Maze to Isolate the Role that Visual Features Play in Navigational Decisions

Integrating Visual Psychophysical Assays within a Y-Maze to Isolate the Role that Visual Features Play in Navigational Decisions

Published on: May 2, 2019

Area of Science:

Neuroscience
Computational Neuroscience
Visual Neuroscience

Background:

Traditional vision research focuses on stationary subjects.
Recent virtual reality studies in mice show spatial context modulates visual cortex responses.
This suggests visual processing is integrated with navigation.

Purpose of the Study:

To review findings on spatial context in mouse vision.
To discuss information flow from visual to navigational brain areas.
To propose a two-stream model for spatial signal processing.

Main Methods:

Review of existing virtual reality studies in mice.
Analysis of visual field coverage in mouse higher visual areas.
Hypothetical modeling of visual-spatial processing streams.

Main Results:

Visual cortex responses are modulated by spatial context, even in identical scenes.
Mouse higher visual areas exhibit distinct visual field coverages.
A two-stream processing hypothesis is proposed based on visual field bias.

Conclusions:

Spatial context is a critical factor in visual processing during navigation.
A novel two-stream model suggests separate processing for landmark (central field) and self-motion (peripheral field) cues.
This model integrates visual information with navigational demands.