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Related Concept Videos

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.
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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...
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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
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Hierarchy of Motor Control01:18

Hierarchy of Motor Control

The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.

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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
07:03

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Published on: July 31, 2019

Interhemispheric control of unilateral movement.

Vincent Beaulé1, Sara Tremblay, Hugo Théoret

  • 1Department of Psychology, University of Montreal, Montreal, QC, Canada H3C 3J7.

Neural Plasticity
|January 11, 2013
PubMed
Summary

The brain uses a complex network for unilateral movements, with transcallosal interhemispheric inhibition (IHI) crucial for motor control. IHI impacts handedness and recovery from neurological conditions like stroke.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Unilateral movements require extensive brain networks, involving both cortical and subcortical areas.
  • Healthy adults typically perform unimanual tasks without activating contralateral muscles.
  • Mirror movements can occur in healthy individuals under conditions of task complexity, fatigue, or during development and aging.

Purpose of the Study:

  • To explore the role of interhemispheric communication in motor control.
  • To focus on transcallosal interhemispheric inhibition (IHI) as a key mechanism.
  • To understand IHI's involvement in handedness, neurological disorders, and rehabilitation.

Main Methods:

  • The study focuses on the neural pathways facilitating unilateral movements.
  • Emphasis is placed on the corpus callosum (CC) as a likely conduit for interhemispheric communication.
  • The primary mechanism investigated is transcallosal interhemispheric inhibition (IHI).

Main Results:

  • Lateralization of movement relies on intricate interhemispheric communication.
  • Transcallosal IHI is identified as a facilitator of complex unilateral movements.
  • IHI's significance is highlighted in relation to handedness and clinical conditions.

Conclusions:

  • The brain's capacity for strictly unilateral movements depends on a sophisticated cortical and subcortical network.
  • Transcallosal interhemispheric inhibition plays a vital role in enabling precise motor control and appears critical for handedness.
  • Understanding IHI is important for comprehending pathological conditions like Parkinson's disease and for stroke recovery strategies.