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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...

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.

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.

Sensory Perception: Organization of the Somatosensory System

Sensory Perception: Organization of the Somatosensory System

The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the stimulus...

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 16, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Sensori-motor experience leads to changes in visual processing in the developing brain.

Karin Harman James¹

¹Department of Psychological and Brain Sciences, Indiana University, Bloomington, USA. khjames@indiana.edu

Developmental Science

|February 9, 2010

Summary

This summary is machine-generated.

Learning to print letters enhances visual processing in preschoolers. Sensorimotor experience strengthens neural systems for letter recognition, supporting the

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Last Updated: Jun 16, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision

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Published on: June 13, 2019

A Method to Quantify Visual Information Processing in Children Using Eye Tracking

A Method to Quantify Visual Information Processing in Children Using Eye Tracking

Published on: July 9, 2016

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In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution

Published on: November 21, 2023

Area of Science:

Cognitive Neuroscience
Developmental Psychology
Neuroscience

Background:

Cortical functional specialization is crucial for efficient neural processing, as suggested by Broca's early studies.
The development of neural specialization, particularly for letter recognition, is influenced by the type of learning involved.
Understanding how learning shapes brain development is a key question in cognitive neuroscience.

Purpose of the Study:

To investigate the role of sensorimotor versus visual learning in the development of neural specialization for letters in preschoolers.
To compare brain activation patterns before and after different learning conditions using functional magnetic resonance imaging (fMRI).
To determine if 'learning-by-doing' strengthens neural systems for visual letter recognition.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
Preschool children participated in two learning conditions: sensorimotor (printing letters) and visual recognition.
Brain activation patterns were compared before and after the learning phases.

Main Results:

A left-hemisphere bias for letter processing was observed in pre-literate children.
Enhanced blood oxygen-level-dependent (BOLD) activation in the visual association cortex occurred after sensorimotor (printing) learning.
No significant activation changes were noted in the visual recognition group.

Conclusions:

Sensorimotor experience, such as printing, enhances visual processing in the brains of preschool children.
The findings provide evidence that 'learning-by-doing' can establish and reinforce neural pathways for visual letter recognition.
This study highlights the importance of active engagement in learning for neural system development.