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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.
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,...
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...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Related Experiment Video

Updated: Jun 2, 2026

Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time
07:12

Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time

Published on: July 1, 2014

Inter-area correlations in the ventral visual pathway reflect feature integration.

Jeremy Freeman1, Tobias H Donner, David J Heeger

  • 1Center for Neural Science, New York University, New York, NY 10003, USA. freeman@cns.nyu.edu

Journal of Vision
|April 28, 2011
PubMed
Summary
This summary is machine-generated.

Visual crowding disrupts feature integration in the brain by reducing neural communication. This finding reveals how the brain processes complex objects and may explain visual crowding effects.

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Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

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Related Experiment Videos

Last Updated: Jun 2, 2026

Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time
07:12

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Published on: July 1, 2014

Cross-Modal Multivariate Pattern Analysis
13:51

Cross-Modal Multivariate Pattern Analysis

Published on: November 9, 2011

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
07:11

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

Published on: December 8, 2023

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Object perception involves integrating simple features into complex representations.
  • Visual crowding is a phenomenon that interferes with this integration process.

Purpose of the Study:

  • To identify a neural correlate of feature integration using visual crowding.
  • To investigate how crowding affects inter-areal communication in the ventral visual pathway.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure cortical activity in human subjects.
  • Simultaneous measurements were taken in multiple ventral visual pathway areas (V1-V4, VWFA).
  • Subjects viewed crowded and uncrowded letters, and grating patches.

Main Results:

  • Temporal correlations between cortical areas were lower for crowded letters compared to uncrowded letters.
  • This reduction in correlation was particularly notable between V1 and the visual word form area (VWFA).
  • The effect was retinotopically specific and independent of attention, but absent for uncrowded gratings.

Conclusions:

  • Inter-area correlations in the ventral visual pathway reflect feature integration.
  • Visual crowding disrupts feature integration by perturbing neural transformations.
  • This suggests crowding interferes with the brain's ability to build object representations from basic features.