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Related Concept Videos

Visual System01:26

Visual System

426
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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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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
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Vision01:24

Vision

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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.
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Parallel Processing01:20

Parallel Processing

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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: May 11, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

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Large-scale functional networks underlying visual attention.

Alexander J Cook1, Hee Yeon Im1, Deborah E Giaschi2

  • 1Department of Psychology, The University of British Columbia, 2136 West Mall, Vancouver, British Columbia V6T 1Z4, Canada; BC Children's Hospital, 4480 Oak St., Vancouver, British Columbia, V6H 3V4, Canada.

Neuroscience and Biobehavioral Reviews
|April 17, 2025
PubMed
Summary
This summary is machine-generated.

The brain

Keywords:
AttentionEEGFMRIFunctional connectivity networksVisualVisuospatial attention

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Attention networks are brain regions controlling behavior during attentional tasks.
  • Definitions vary based on task demands and modalities.
  • The Attention Network Task (ANT) models alerting, orienting, and executive control.

Purpose of the Study:

  • To review evidence for a unified attention system in visual attention.
  • To compare neuroimaging findings across various attention-related tasks.
  • To discuss limitations of an independent attention system model.

Main Methods:

  • Review of neuroimaging studies (fMRI, EEG, MEG).
  • Analysis of tasks including visual cueing, visual search, and divided attention.
  • Comparison of evidence supporting a distinct attention system.

Main Results:

  • Evidence for distinct networks underlying alerting, orienting, and executive control.
  • Variability in network definitions across studies and tasks.
  • Neuroimaging data shows overlapping activations for attention and other cognitive processes.

Conclusions:

  • The existence of a unified, independent attention system is debated.
  • Visual attention involves flexible brain mechanisms rather than a single, isolated system.
  • Limitations exist in defining attention solely through specific network models.