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Related Concept Videos

Vision01:24

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 System01:26

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 Cortex01:14

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 Processing01:20

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...
Association Areas of the Cortex01:21

Association Areas of the Cortex

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,...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

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Published on: April 11, 2025

Perceptual learning selectively refines orientation representations in early visual cortex.

Janneke F M Jehee1, Sam Ling, Jascha D Swisher

  • 1Psychology Department and Vanderbilt Vision Research Center, Vanderbilt University, Nashville, Tennessee 37240, USA. janneke.jehee@donders.ru.nl

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 24, 2012
PubMed
Summary
This summary is machine-generated.

Extensive practice refines visual cortex representations. Training selectively enhances neural responses to specific orientations, improving perceptual performance without altering overall brain activity.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Perceptual performance improves with practice, but the underlying neural mechanisms in humans are not fully understood.
  • Previous research has not clearly defined how the brain adapts to enhance specific visual discriminations.

Purpose of the Study:

  • To investigate the neural basis of perceptual learning in the human visual cortex.
  • To determine if extensive practice selectively enhances neural representations of trained visual information.

Main Methods:

  • Used functional magnetic resonance imaging (fMRI) and a novel signal detection analysis.
  • Trained twelve participants to discriminate grating orientation over multiple sessions.
  • Measured orientation-selective responses in visual areas (V1-V4) before and after training.

Main Results:

  • Training improved discrimination sensitivity twofold for trained orientations and locations.
  • Neural representation enhancement was specific to trained orientations, not untrained ones.
  • Enhanced orientation-selective responses in V1-V4 predicted behavioral improvements.

Conclusions:

  • Extensive practice induces targeted functional reorganization in the human visual cortex.
  • Perceptual learning refines cortical representation of behaviorally relevant visual information.
  • Neural changes in early visual areas underpin behavioral improvements in visual discrimination.