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

Somatosensory, Motor, and Association Cortex

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 the...

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Related Experiment Video

Updated: Jun 25, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
08:42

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex

Published on: February 8, 2020

Functional selectivity of interhemispheric connections in cat visual cortex.

N L Rochefort1, P Buzás, N Quenech'du

  • 1Department of Neurophysiology, MA 4/149, Ruhr-Universität, Bochum, Germany. nathalie.rochefort@lrz.tu-muenchen.de

Cerebral Cortex (New York, N.Y. : 1991)
|February 6, 2009
PubMed
Summary
This summary is machine-generated.

Callosal connections in cats link visual areas representing the same orientation and location. This specific organization aids in processing visual information for a unified perception across both visual fields.

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Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Cortical Connectivity

Background:

  • The corpus callosum facilitates interhemispheric communication in the brain.
  • Understanding the functional specificity of callosal connections is crucial for comprehending visual processing.

Purpose of the Study:

  • To investigate the functional specificity of callosal connections in the visual cortex (areas 17 and 18) of adult cats.
  • To determine how callosal axons are organized in relation to functional maps.

Main Methods:

  • Combined in vivo optical imaging of intrinsic signals with neuronal tracer labeling of callosal axons.
  • Reconstructed eight single callosal axons in the hemisphere opposite to the injection site.
  • Analyzed the distribution of injection sites and axon terminals against functional maps.

Main Results:

  • Callosal axons typically formed 2-3 synaptic bouton clusters in layers II/III and upper layer IV.
  • These clusters were located in regions with the same orientation and visuotopic location as the injection sites.
  • The distribution of clusters was elongated, aligning with the preferred orientation at the injection site.

Conclusions:

  • Demonstrated specific organization of interhemispheric axons linking corresponding visual cortical regions.
  • Suggests visual callosal connections are vital for processing coherent visual information (shape, position).
  • Facilitates the integration of visual hemifields into a unified percept.