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Relationship between motor and language activation using fMRI.

D W Loring1, K J Meador, J D Allison

  • 1Department of Neurology, Medical College of Georgia, Augusta 30912-3275, USA.

Neurology
|February 26, 2000
PubMed
Summary
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Individuals with dominant left hemisphere language processing also show stronger right-hand motor activation in that same hemisphere. This suggests a link between language lateralization and motor control lateralization.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Hemispheric lateralization, the specialization of brain functions in one hemisphere, is well-established for language.
  • Motor control also exhibits lateralization, with the contralateral hemisphere typically dominant for fine motor movements.

Purpose of the Study:

  • To investigate the relationship between language lateralization and motor control lateralization in healthy adults.
  • To determine if functional MRI (fMRI) can reveal correlations between brain activity patterns during language and motor tasks.

Main Methods:

  • Functional MRI (fMRI) scans were acquired from 12 healthy volunteers.
  • Participants performed unimanual left-hand finger movements, right-hand finger movements, and a verb generation language task.

Related Experiment Videos

  • Laterality ratios (L-R)/(L+R) were calculated for each task to quantify hemispheric activation asymmetry.

    • Main Results:

    • A significant positive correlation was found between language lateralization and right-hand motor asymmetry (rho = 0.71, p = 0.005).
    • A significant negative correlation was observed between left-hand and right-hand motor asymmetry (rho = -0.68, p = 0.008).
    • Individuals with greater left hemisphere dominance for language showed greater unilateral activation in the right hemisphere during right-hand movements.

    Conclusions:

    • Language lateralization is associated with motor control lateralization, particularly for right-hand movements.
    • The findings suggest a shared neural basis or interaction between language processing and fine motor control lateralization.
    • fMRI is a valuable tool for exploring the relationship between different cognitive and motor functions in the human brain.