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Related Concept Videos

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.

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.

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...

Retrieval

Retrieval

Retrieval is the process of getting information out of memory storage and back into conscious awareness. This ability is essential for daily tasks like brushing hair and teeth, driving to work, and performing job duties. Retrieval occurs in three ways: recall, recognition, and relearning.
Recall involves accessing information without cues, such as during an essay test, where individuals must retrieve facts and concepts from memory unaided. Another example is remembering the name of a colleague...

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.

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Related Experiment Video

Updated: May 30, 2026

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients

Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients

Published on: June 17, 2019

Cortical mechanisms of visual context processing in singleton search.

Anna Schubö¹, Elkan G Akyürek, En-Ju Lin

¹Ludwig Maximilian University, Munich, Germany. anna.schuboe@staff.uni-marburg.de

Neuroscience Letters

|August 2, 2011

Summary

This summary is machine-generated.

Visual search efficiency depends on how different a target is from its surroundings and how similar the surrounding items are. Brain activity in specific regions like the precuneus and middle temporal gyrus increases with higher context homogeneity and feature contrast.

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Area of Science:

Cognitive Neuroscience
Visual Perception
Neuroimaging

Background:

Visual search efficiency is influenced by target-context dissimilarity and context homogeneity.
Understanding the neural basis of visual search in complex scenes is crucial.

Purpose of the Study:

To investigate the cortical mechanisms underlying visual search with varying context homogeneity.
To determine how brain activity changes based on the homogeneity and feature contrast of the visual search environment.

Main Methods:

Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
Participants performed a visual search task with contexts of differing homogeneity and local feature contrast.

Main Results:

Increased brain activity was observed in the precuneus, cingulate gyrus, and middle temporal gyrus with higher context homogeneity and local feature contrast.
Areas near the corpus callosum and the medial frontal gyrus were more involved in contexts with low homogeneity and local feature contrast.

Conclusions:

Contextual grouping and local target detection are distinct but contributing factors in visual search.
The findings elucidate the neural correlates of processing contextual information during visual search tasks.