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Speech-induced modulation of interhemispheric inhibition.

Tadashige Kano¹, Masahito Kobayashi, Takayuki Ohira

¹Department of Neurosurgery, Keio University School of Medicine, Tokyo, Japan. tadashige@2001.jukuin.keio.ac.jp

Neuroscience Letters

|November 6, 2012

Summary

This summary is machine-generated.

Speech may alter brain communication by suppressing inhibition between motor areas. This finding on interhemispheric dominance could enhance stroke recovery strategies.

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Area of Science:

Neuroscience
Motor Control
Brain Plasticity

Background:

Interhemispheric communication is crucial for motor control.
The primary motor areas (M1s) in each hemisphere influence each other.
The impact of oral activities like speech and mastication on this interaction is not fully understood.

Purpose of the Study:

To investigate how speech and mastication affect interhemispheric inhibition between the left and right primary motor areas (M1s).
To explore potential modifications in brain activity during these oral tasks compared to rest.

Main Methods:

Utilized transcranial magnetic stimulation (TMS) to assess interhemispheric inhibition.
Recorded motor-evoked potentials (MEPs) from the first dorsal interossei (FDIs) of both hands in 10 healthy subjects.
Compared MEPs during rest, mastication, and speech (reading aloud).

Main Results:

Significant inhibition of left FDI MEPs by left M1 conditioning occurred under all conditions.
The right M1 significantly inhibited the left M1 during rest and mastication, but not during speech.
Speech tasks appeared to suppress the inhibitory influence of the right M1 on the left M1.

Conclusions:

Speech may modulate dominant M1 activity through enhanced functional connectivity or by altering interhemispheric balance.
This suppression of inhibition during speech highlights a novel aspect of interhemispheric dominance.
Findings may inform improved therapeutic strategies for neurological conditions like stroke.