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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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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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Related Experiment Video

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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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Functional rostro-caudal gradient in the human posterior lateral frontal cortex.

Céline Amiez1, Michael Petrides2

  • 1Univ Lyon, Université Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 18, Avenue du Doyen Lépine, 69500, Bron, France. celine.amiez@inserm.fr.

Brain Structure & Function
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The posterior lateral frontal cortex shows a functional organization along a rostro-caudal axis. This gradient reflects a hierarchical control of action, separating basic movements from cognitive selection processes.

Keywords:
Conditional visuo-motor associationsFunctional gradientHumanfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • The posterior lateral frontal cortex is crucial for motor control.
  • Previous research suggests functional specialization within this region.
  • The precise organization, particularly along a rostro-caudal axis, remains to be fully elucidated.

Purpose of the Study:

  • To test the hypothesis of a rostro-caudal functional organization in the posterior lateral frontal cortex.
  • To differentiate brain regions involved in basic motor actions versus cognitive selection of actions.
  • To investigate potential effector specificity (eye vs. hand) in this organization.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan subjects.
  • Subjects performed tasks involving basic eye/hand movements and cognitive selection of movements based on conditional rules.
  • Analysis focused on identifying precise relationships between functional activity foci and specific sulci on a subject-by-subject basis.

Main Results:

  • Basic eye movements activated the Frontal Eye Field (FEF) in the superior precentral sulcus.
  • High-level selection of saccadic eye movements localized anterior to FEF in the superior frontal sulcus.
  • Basic hand movements activated primary motor cortex; selection localized anteriorly in the superior precentral sulcus.
  • Distinct, non-overlapping anterior regions for cognitive selection of eye and hand movements were observed, indicating effector specificity.

Conclusions:

  • The posterior lateral frontal cortex exhibits a functional rostro-caudal gradient.
  • This gradient reflects a hierarchical organization of action control, with posterior regions for basic actions and anterior regions for cognitive selection.
  • The findings suggest effector-specific organization within the anterior lateral frontal cortex for action selection.