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Brain imaging studies of developmental stuttering.

R J Ingham1

  • 1Department of Speech and Hearing Sciences, University of California, Santa Barbara, 93106, USA. rjingham@speech.ucsb.edu

Journal of Communication Disorders
|December 1, 2001
PubMed
Summary

Brain imaging studies reveal that stuttering involves abnormal temporal lobe activation during speech. This may indicate a breakdown in phonologic planning and sequencing within premotor regions.

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Area of Science:

  • Neuroscience
  • Speech and Language Pathology

Background:

  • Developmental stuttering is a complex speech disorder.
  • Recent advancements in neuroimaging offer insights into its underlying mechanisms.

Purpose of the Study:

  • To review recent brain imaging research on stuttering.
  • To present findings from positron emission tomography (PET) studies conducted at the University of Texas Health Science Center in San Antonio.
  • To reconcile inconsistencies across various neuroimaging studies of stuttering.

Main Methods:

  • Review of existing literature on neuroimaging of stuttering.
  • Analysis of four H2(15)O positron emission tomography (PET) studies.
  • Consideration of magnetoencephalography (MEG) and transcranial magnetic stimulation (TMS) research.

Main Results:

  • Consistent findings point to impaired temporal lobe activation during speech in individuals who stutter.
  • Evidence suggests a potential breakdown in the sequencing of premotor regions involved in phonologic planning.
  • Inconsistencies across studies are highlighted and addressed.

Conclusions:

  • Neuroimaging findings increasingly suggest that stuttering is associated with atypical temporal lobe function during speech production.
  • A breakdown in phonologic planning and sequential processing in premotor areas may underlie stuttering.
  • Further research is needed to fully elucidate the neurophysiological underpinnings of stuttering.

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