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Related Concept Videos

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...
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.
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,...
Cerebral Hemispheres01:05

Cerebral Hemispheres

The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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.
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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Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography

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The visual callosal connection: a connection like any other?

Kerstin E Schmidt1

  • 1Brain Institute, University of Rio Grande do Norte, Av. Nascimento de Castro 2155, 59056-450 Natal, RN, Brazil. kschmidt@neuro.ufrn.br

Neural Plasticity
|May 2, 2013
PubMed
Summary

Visual callosal connections in mammals mirror lateral intrahemispheric circuits in early visual areas. These connections primarily modify neural responses multiplicatively, adapting dynamically to visual input.

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Area of Science:

  • Neuroscience
  • Visual System Research
  • Comparative Neurology

Background:

  • The role of visual callosal connections in ferrets and cats is under review.
  • Morphological and functional similarities between lateral intrinsic and callosal networks in early visual areas are explored.

Purpose of the Study:

  • To discuss the homologies between lateral intrinsic and callosal networks in early visual areas.
  • To elucidate the functional impact of visual callosal input on neuronal responses.
  • To propose an interpretation of callosal circuit function in early visual areas based on lateral connectivity principles.

Main Methods:

  • Review of recent research on visual callosal connections.
  • Analysis of anatomical and functional evidence from corticocortical and lateral circuits.
  • Consideration of reversible deactivation studies.

Main Results:

  • Both callosal and lateral networks link neuronal groups with similar response properties.
  • Callosal input perpetuates the function of intrahemispheric circuits to the contralateral hemisphere.
  • Visual callosal input primarily causes multiplicative response shifts, not changes in selectivity.
  • The gain and balance of callosal action dynamically adapt to visual stimulus drive.

Conclusions:

  • Visual callosal connections share more characteristics with lateral intrahemispheric connections than feedback connections.
  • The function of visual callosal connections can be understood in the context of general lateral connectivity.
  • Callosal connections play a crucial role in interhemispheric visual information processing.