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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.

Focusing of Light in the Eye

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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.

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...

Gestalt Principles of Perception

Gestalt Principles of Perception

Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...

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...

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Related Experiment Video

Updated: Jun 30, 2026

VisualEyes: A Modular Software System for Oculomotor Experimentation

VisualEyes: A Modular Software System for Oculomotor Experimentation

Published on: March 25, 2011

Modulation of human visual cortex by crossmodal spatial attention.

E Macaluso¹, C D Frith, J Driver

¹Institute of Cognitive Neuroscience, University College London, UK. Wellcome Department of Cognitive Neurology, Institute of Neurology, London, UK. e.macaluso@fil.ion.ucl.ac.uk

Science (New York, N.Y.)

|August 19, 2000

Summary

This summary is machine-generated.

A gentle touch can sharpen vision in the same visual field, demonstrating crossmodal spatial attention. This touch influences the visual cortex through connections from other brain regions, impacting visual processing.

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Last Updated: Jun 30, 2026

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Area of Science:

Neuroscience
Cognitive Science
Sensory Integration

Background:

Crossmodal interactions between senses, like vision and touch, are crucial for spatial attention.
Previous research often focused on multimodal brain areas, overlooking potential effects on unimodal regions.
The precise neural mechanisms underlying crossmodal spatial attention remain incompletely understood.

Purpose of the Study:

To investigate the impact of simultaneous visuo-tactile stimulation on human visual cortex activity.
To explore whether tactile stimulation affects unimodal visual areas.
To elucidate the neural pathways involved in crossmodal spatial attention.

Main Methods:

Utilized functional magnetic resonance imaging (fMRI) to measure brain activity.
Applied simultaneous visual and tactile stimuli to participants.
Analyzed effective connectivity between different brain regions using computational models.

Main Results:

Tactile stimulation significantly enhanced activity in the visual cortex.
This enhancement occurred only when tactile and visual stimuli were presented on the same side of space.
Effective connectivity analysis revealed that touch influences the unimodal visual cortex via feedback from multimodal parietal areas.

Conclusions:

Tactile input can modulate activity in unimodal visual cortex, challenging previous assumptions.
Crossmodal spatial attention involves feedback mechanisms from higher-order association areas to sensory cortices.
This study provides a neural basis for how touch influences spatial visual processing.