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Related Concept Videos

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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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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Depth Perception and Spatial Vision01:15

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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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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.
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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:
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Related Experiment Video

Updated: Feb 24, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Goal-Directed Visual Processing Differentially Impacts Human Ventral and Dorsal Visual Representations.

Maryam Vaziri-Pashkam1, Yaoda Xu1

  • 1Vision Sciences Laboratory, Department of Psychology, Harvard University, Cambridge, Massachusetts 02138 mvaziri@fas.harvard.edu xucogneuro@gmail.com.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 20, 2017
PubMed
Summary
This summary is machine-generated.

The ventral and dorsal visual pathways process "what" and "where" information, respectively. This study reveals ventral pathway representations are invariant, while dorsal pathway representations are adaptive to task demands, maintaining distinct roles.

Keywords:
attentiondorsal streamobject representationtaskventral stream

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • The traditional ventral "what" and dorsal "where" visual processing pathways are challenged by findings of cross-pathway information.
  • Understanding how goal-directed processing impacts these pathways is crucial for refining visual processing models.

Purpose of the Study:

  • To investigate how goal-directed visual information processing differentially affects object category representations in the ventral and dorsal visual pathways.
  • To determine if the functional distinction between the two pathways remains valid despite shared information types.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) and multivariate pattern analysis were used in three experiments.
  • Participants viewed objects with manipulated task relevance (color vs. shape) and feature conjunctions.
  • Shape-based object category decoding was analyzed in occipitotemporal (ventral) and parietal (dorsal) regions.

Main Results:

  • Object category representations in both ventral and dorsal regions were influenced by task relevance.
  • Ventral regions showed representations primarily driven by object shape variations, exhibiting greater invariance.
  • Dorsal regions demonstrated greater sensitivity to task relevance, with both object category and task contributing significantly to representations.

Conclusions:

  • Visual representations in the ventral pathway are more invariant, reflecting "what an object is."
  • Visual representations in the dorsal pathway are more adaptive, reflecting "what we do with it."
  • Despite shared information, the ventral and dorsal pathways maintain fundamentally different roles in visual information representation.