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Online Transcranial Magnetic Stimulation Protocol for Measuring Cortical Physiology Associated with Response Inhibition
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Intermanual Differences in movement-related interhemispheric inhibition.

Julie Duque1, Nagako Murase, Pablo Celnik

  • 1National Institutes of Health, Bethesda, MD 20817, USA.

Journal of Cognitive Neuroscience
|February 7, 2007
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Summary

Interhemispheric inhibition (IHI) differs between dominant and nondominant hands during movement preparation. Dominant hand movements show a shift from inhibition to facilitation, unlike nondominant hands, impacting motor control and dexterity.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Interhemispheric inhibition (IHI) between motor cortical areas is crucial for motor control.
  • IHI may influence manual dexterity and intermanual differences.

Purpose of the Study:

  • To investigate IHI preceding dominant and nondominant hand movements in healthy volunteers.
  • To understand the role of IHI in motor cortical control during voluntary movements.

Main Methods:

  • Utilized a double-pulse transcranial magnetic stimulation protocol.
  • Studied movement-related IHI in right-handed individuals during a simple reaction time task.
  • Measured IHI targeting motor cortex contralateral (IHI(c)) and ipsilateral (IHI(i)) to the moving finger.

Main Results:

  • IHI(c) was similar for both hands after the go signal.
  • Near movement onset, IHI(c) shifted to facilitation for the dominant hand but remained inhibitory for the nondominant hand.
  • IHI(i) showed consistent inhibition with a trough early in the premovement period for both hands.

Conclusions:

  • Interhemispheric interactions are modulated more during dominant than nondominant hand movement generation.
  • A shift from balanced IHI at rest to ipsilateral M1-directed IHI occurs at movement onset.
  • This mechanism may facilitate dominant hand movement by releasing contralateral M1 inhibition and preventing ipsilateral M1 mirror activity.