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Related Experiment Video

Updated: Dec 2, 2025

Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
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The relationship between lateralization patterns from sequence based motor tasks and hemispheric speech dominance.

Jessica C Hodgson1, Daniel Richardson2, John M Hudson2

  • 1Lincoln Medical School, College of Science, University of Lincoln.

Neuropsychology
|November 2, 2020
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Summary

Skilled motor tasks and speech both favor the left hemisphere. This study used functional transcranial doppler (fTCD) to show that specific motor tasks, like the pegboard test, correlate with speech lateralization, suggesting a shared neural control mechanism.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • Skilled motor praxis and speech production exhibit right-hand and left-hemisphere dominance, respectively.
  • Shared neural architecture is theorized to link praxis and speech, but their behavioral relationship remains under-investigated.
  • Left-hemisphere specialization for sequential information processing is a key hypothesis linking these functions.

Purpose of the Study:

  • To investigate the behavioral relationship between skilled motor praxis and speech lateralization.
  • To test if praxis tasks, particularly those relying on sequential processing, correlate with speech lateralization indices.
  • To explore the utility of functional transcranial doppler (fTCD) ultrasound in measuring hemispheric activation during motor tasks.

Main Methods:

  • Functional transcranial doppler (fTCD) ultrasound was employed to measure hemispheric activation during various skilled manual praxis tasks.
  • Two experiments were conducted, assessing correlations between motor task performance and established speech lateralization indices.
  • A novel imaging paradigm was used to analyze hemispheric activation patterns during praxis.

Main Results:

  • Only specific praxis tasks (pegboard and coin rotation) showed a correlation with speech lateralization, despite shared task properties.
  • The pegboard task demonstrated a distinct lateralization pattern and a significant relationship with speech laterality indices.
  • Other tested motor tasks did not show a significant relationship with speech lateralization.

Conclusions:

  • Results support a lateralized speech-praxis control mechanism, suggesting a shared neural basis.
  • Functional transcranial doppler (fTCD) is a reliable method for studying the behavioral relationship between speech and handedness.
  • The findings highlight the importance of task-specific analysis in understanding the link between motor control and language lateralization.