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Related Concept Videos

Lateralization01:28

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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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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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Motor imagery perspective and brain oscillations characteristics: Differences between right- and left-handers.

Dariusz Zapała1, Paweł Augustynowicz1, Tomasz Jankowski2

  • 1Department of Experimental Psychology, The John Paul II Catholic University of Lublin, Lublin 20950, Poland.

Brain Research Bulletin
|December 4, 2024
PubMed
Summary

Left-handed individuals use more visual processing for motor imagery (MI) of their non-dominant hand, while right-handed individuals may create multimodal images during MI tasks. This study explored brain activity during kinesthetic, internal visual, and external visual motor imagery.

Keywords:
Event-related (de)synchronizationExternal visual-motor imageryHandednessImaginary part of coherenceInternal visual-motor imageryKinesthetic motor imagery

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • Motor imagery (MI) involves kinesthetic (KMI), internal visual (IVMI), and external visual (EVMI) components.
  • Understanding hemispheric differences in MI processing is crucial for brain-computer interfaces and rehabilitation.

Purpose of the Study:

  • To investigate α/β oscillations and connectivity during different types of MI (KMI, IVMI, EVMI) in left- and right-handed individuals.
  • To explore how handedness influences brain activity and connectivity patterns during motor imagery of dominant and non-dominant hands.

Main Methods:

  • EEG analysis of α/β oscillations and imaginary part of coherence (ICOH) in visual and motor ROIs.
  • Participants included 20 left-handed and 20 right-handed volunteers.
  • MI tasks involved left/right-hand movements across KMI, IVMI, and EVMI conditions.

Main Results:

  • Left-handed individuals showed greater α/β activity in visual regions during EVMI for the non-dominant hand compared to IVMI.
  • Right-handed individuals exhibited visual cortex suppression during KMI, suggesting internal focus.
  • ICOH connectivity varied by handedness, task, and hand, with stronger connections for non-dominant hand EVMI in right-handers.

Conclusions:

  • Left-handed individuals appear to rely more on visual representations during MI, particularly for the non-dominant hand.
  • Right-handed individuals may engage in more multimodal imagery during motor imagery tasks.
  • Handedness significantly modulates neural strategies employed during motor imagery.