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Motor and Sensory Areas of the Cortex01:14

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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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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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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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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.
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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Cross-modal integration and plasticity in the superior temporal cortex.

Stefania Benetti1, Olivier Collignon2

  • 1Center for Mind/Brain Sciences - CIMeC, University of Trento, Trento, Italy.

Handbook of Clinical Neurology
|August 14, 2022
PubMed
Summary

Congenitally deaf individuals show enhanced temporal lobe responses to nonauditory stimuli. This cross-modal plasticity in the brain follows principles seen in hearing individuals, suggesting shared neural mechanisms.

Keywords:
Cross-modal integrationCross-modal plasticityDeafnessFunctional selectivitySensory deprivationSuperior temporal cortex

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Auditory and cross-modal plasticity

Background:

  • The temporal cortex, typically auditory, is recruited by nonauditory information in congenital deafness.
  • The underlying neural mechanisms and functional principles of this cross-modal recruitment remain debated.
  • Understanding this plasticity is crucial for auditory recovery after sensory restoration.

Purpose of the Study:

  • To investigate the organizational principles of visual input recruitment in the temporal regions of congenitally deaf individuals.
  • To propose a unifying framework for multisensory integration and cross-modal plasticity in the superior temporal cortex.

Main Methods:

  • The study focuses on analyzing the functional and structural mechanisms of cross-modal plasticity.
  • It compares the organizational principles in deaf and hearing brains regarding multisensory convergence.
  • The research examines innate anatomo-functional links between sensory systems.

Main Results:

  • Cross-modal recruitment of temporal regions by visual input in congenital deafness adheres to principles found in the hearing brain.
  • Functional and structural mechanisms for multisensory convergence in hearing individuals provide a basis for cross-modal input in deafened temporal areas.
  • Innate connections between auditory and other sensory systems support both early integration and selective plasticity.

Conclusions:

  • The brain's temporal regions in congenitally deaf individuals exhibit cross-modal plasticity that mirrors organizational principles in hearing individuals.
  • Existing multisensory integration mechanisms in the temporal cortex serve as a substrate for accommodating nonauditory information in deafness.
  • Anatomo-functional links between sensory systems are fundamental to multisensory integration and cross-modal plasticity in the superior temporal cortex.