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Related Concept Videos

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
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....
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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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Somatosensory, Motor, and Association Cortex01:23

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Association Areas of the Cortex01:21

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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:
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Visual System01:26

Visual System

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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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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: Feb 19, 2026

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

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Perceptual integration and attention in human extrastriate cortex.

Francesca Strappini1,2,3, Gaspare Galati4,5, Marialuisa Martelli4,5

  • 1Neurobiology Department, Weizmann Institute of Science, Rehovot, Israel. francescastrappini@gmail.com.

Scientific Reports
|November 3, 2017
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Summary

Visual crowding, a key perceptual process, impacts object recognition and reading. This study found crowding increases brain activity in visual areas, with attention modulating this effect in higher visual areas like V4/V8 and the visual word form area (VWFA).

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Visual crowding is a significant perceptual phenomenon affecting object recognition, reading, and clinical conditions like dyslexia.
  • Understanding the neural basis of visual crowding is crucial for both basic science and clinical applications.

Purpose of the Study:

  • To investigate how attentional states modulate the brain's blood-oxygen-level-dependent (BOLD) response during visual crowding.
  • To identify the specific brain regions involved in visual crowding and the influence of attention.

Main Methods:

  • Combined event-related functional magnetic resonance imaging (fMRI) with wide-field brain mapping.
  • Measured BOLD activity in early visual areas, including the visual word form area (VWFA), while participants viewed crowded and uncrowded stimuli under attended and unattended conditions.
  • Utilized psychophysical training to standardize participant performance.

Main Results:

  • Visual crowding increased BOLD activity across a network of visual areas, including V1, V2, V3A, V4/V8, and VWFA.
  • Attention significantly modulated BOLD activity in V4/V8 and the VWFA.
  • The impact of crowding on activity in V1 was observed only when attention was directed to the target.

Conclusions:

  • The findings suggest that brain areas beyond V1 are likely candidates for the neural locus of visual crowding.
  • This supports the conceptualization of visual crowding as a mid-level visual processing phenomenon.
  • Attention plays a critical role in modulating visual crowding effects in higher-level visual processing areas.