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Published in: BMC Neurology 1/2004

Open Access 01-12-2004 | Research article

Morphological brain differences between adult stutterers and non-stutterers

Authors: Lutz Jäncke, Jürgen Hänggi, Helmuth Steinmetz

Published in: BMC Neurology | Issue 1/2004

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Abstract

Background

The neurophysiological and neuroanatomical foundations of persistent developmental stuttering (PDS) are still a matter of dispute. A main argument is that stutterers show atypical anatomical asymmetries of speech-relevant brain areas, which possibly affect speech fluency. The major aim of this study was to determine whether adults with PDS have anomalous anatomy in cortical speech-language areas.

Methods

Adults with PDS (n = 10) and controls (n = 10) matched for age, sex, hand preference, and education were studied using high-resolution MRI scans. Using a new variant of the voxel-based morphometry technique (augmented VBM) the brains of stutterers and non-stutterers were compared with respect to white matter (WM) and grey matter (GM) differences.

Results

We found increased WM volumes in a right-hemispheric network comprising the superior temporal gyrus (including the planum temporale), the inferior frontal gyrus (including the pars triangularis), the precentral gyrus in the vicinity of the face and mouth representation, and the anterior middle frontal gyrus. In addition, we detected a leftward WM asymmetry in the auditory cortex in non-stutterers, while stutterers showed symmetric WM volumes.

Conclusions

These results provide strong evidence that adults with PDS have anomalous anatomy not only in perisylvian speech and language areas but also in prefrontal and sensorimotor areas. Whether this atypical asymmetry of WM is the cause or the consequence of stuttering is still an unanswered question.
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Metadata
Title
Morphological brain differences between adult stutterers and non-stutterers
Authors
Lutz Jäncke
Jürgen Hänggi
Helmuth Steinmetz
Publication date
01-12-2004
Publisher
BioMed Central
Published in
BMC Neurology / Issue 1/2004
Electronic ISSN: 1471-2377
DOI
https://doi.org/10.1186/1471-2377-4-23

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