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Increased dopamine activity associated with stuttering

J C Wu1, G Maguire, G Riley

  • 1Department of Psychiatry, University of California, Irvine, 92697, USA.

Neuroreport
|February 10, 1997
PubMed
Summary
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This study suggests stuttering may involve an overactive dopamine system. Positron emission tomography revealed higher tracer uptake in brain regions associated with verbalization for stuttering individuals compared to controls.

Area of Science:

  • Neuroscience
  • Medical Imaging
  • Speech Science

Background:

  • Stuttering is a complex speech disorder with debated neurological underpinnings.
  • The role of the dopamine system in stuttering requires further investigation.

Purpose of the Study:

  • To investigate the role of the presynaptic dopaminergic system in developmental stuttering.
  • To compare dopamine activity in individuals who stutter with healthy controls.

Main Methods:

  • Positron emission tomography (PET) was utilized.
  • 6-FDOPA, a marker for presynaptic dopaminergic activity, was administered.
  • Three patients with moderate to severe developmental stuttering were scanned and compared to six neurotypical controls.

Main Results:

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  • Individuals who stutter exhibited significantly higher 6-FDOPA uptake compared to controls.
  • Elevated uptake was observed in specific brain regions including the medial prefrontal cortex, deep orbital cortex, insular cortex, extended amygdala, auditory cortex, and caudate tail.
  • Increased uptake was particularly noted in ventral limbic cortical and subcortical regions.

Conclusions:

  • The findings support the hypothesis of an overactive presynaptic dopamine system in stuttering.
  • This hyperactivity is localized to brain regions crucial for modulating verbalization.
  • The results provide novel insights into the neurobiology of stuttering.