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Feedback Inhibition00:46

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Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!

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Normal interhemispheric inhibition in persistent developmental stuttering.

Martin Sommer1, Kathrin Knappmeyer, Evke Jane Hunter

  • 1Department of Clinical Neurophysiology, University of Göttingen, Göttingen, Germany. wpaulus@med.uni-goettingen.de

Movement Disorders : Official Journal of the Movement Disorder Society
|February 19, 2009
PubMed
Summary
This summary is machine-generated.

This study found normal interplay between primary motor cortices in adults with persistent developmental stuttering (PDS). Abnormal right-sided brain activity in PDS likely originates from areas beyond primary motor cortex excitability.

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Area of Science:

  • Neuroscience
  • Speech and Language Disorders
  • Motor Control

Background:

  • Functional imaging indicates right hemispheric (pre)motor overactivity in persistent developmental stuttering (PDS).
  • Interhemispheric inhibition (IHI) using transcranial magnetic stimulation (TMS) quantifies communication between motor areas.

Purpose of the Study:

  • To investigate interhemispheric inhibition (IHI) and ipsilateral silent period (iSP) in adults with PDS.
  • To determine if altered primary motor cortex excitability underlies observed right hemispheric overactivity in PDS.

Main Methods:

  • Assessed IHI and iSP duration in 15 young male adults with PDS and 15 age-matched fluent speakers.
  • Utilized transcranial magnetic stimulation (TMS) to measure motor cortex interplay.

Main Results:

  • No significant differences in IHI or iSP duration were found between the PDS group and fluent speakers.
  • This suggests normal functional connectivity between the primary motor cortices in individuals with PDS.

Conclusions:

  • The interplay between primary motor cortices is not significantly different in adults with PDS compared to fluent speakers.
  • Abnormal right-sided motor and premotor activity in PDS likely stems from sources other than primary motor cortex excitability.