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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.
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,...
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,...
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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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Related Experiment Video

Updated: Jun 13, 2026

Where You Cut Matters: A Dissection and Analysis Guide for the Spatial Orientation of the Mouse Retina from Ocular Landmarks
08:42

Where You Cut Matters: A Dissection and Analysis Guide for the Spatial Orientation of the Mouse Retina from Ocular Landmarks

Published on: August 4, 2018

Orientation anisotropies in human visual cortex.

Damien J Mannion1, J Scott McDonald, Colin W G Clifford

  • 1School of Psychology, The University of Sydney, Sydney, Australia. damienm@psych.usyd.edu.au

Journal of Neurophysiology
|April 23, 2010
PubMed
Summary
This summary is machine-generated.

The early visual cortex shows orientation preferences. Horizontal visual stimuli evoked reduced responses in areas V1-V3A/B, while radial orientations increased responses in these areas and hV4.

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Published on: February 8, 2020

Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • The early visual system processes feature orientation, a fundamental visual task.
  • Anisotropic response distributions across orientations offer insights into neural representations.
  • Understanding these representations is crucial for comprehending visual processing.

Purpose of the Study:

  • To investigate orientation-based modulations in cortical activity using functional MRI (fMRI).
  • To identify specific visual areas exhibiting anisotropic responses to different orientations.
  • To explore the relationship between observed cortical anisotropies and environmental factors.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
  • Participants observed sinusoidal gratings with varying orientations.
  • Blood-oxygen-level-dependent (BOLD) signals were analyzed in visual areas V1, V2, V3, V3A/B, and hV4.

Main Results:

  • A significant orientation anisotropy was found in visual areas V1, V2, V3, and V3A/B, with horizontal orientations eliciting reduced responses.
  • These areas, along with hV4, demonstrated further anisotropy where radial orientations (relative to fixation) evoked increased responses.
  • The observed patterns suggest a non-uniform processing of orientation information in the early visual cortex.

Conclusions:

  • Cortical activity in early visual areas exhibits significant anisotropies related to stimulus orientation.
  • These findings may reflect adaptations to the statistical properties and behavioral relevance of orientations in natural environments.
  • The study highlights the complex and non-uniform nature of orientation representation in the human visual system.