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[Gray matter abnormalities in developmental stuttering determined with voxel-based morphometry].

Lu-ping Song¹, Dan-ling Peng, Zhen Jin

¹Rehabilitation College, Capital Medical University, Beijing 100068, China.

Zhonghua Yi Xue Za Zhi

|February 12, 2008

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Adults who stutter show reduced gray matter in the cerebellum and medulla, crucial for speech control. Increased gray matter in other brain regions may represent compensatory mechanisms for speech fluency.

Area of Science:

Neuroscience
Speech Science
Radiology

Context:

Persistent developmental stuttering is a speech disorder affecting adults.
Understanding the neuroanatomical underpinnings of stuttering is crucial for developing effective interventions.
Previous research suggests structural brain differences in individuals who stutter.

Purpose:

To investigate regional gray matter volume differences between adults with persistent developmental stuttering and fluent controls.
To identify anomalous anatomy in speech-relevant brain areas that may impact speech fluency in stutterers.

Summary:

Voxel-based morphometry (VBM) analysis of high-resolution MRI data from 10 adults with developmental stuttering and 12 matched controls revealed significant gray matter volume reductions in the bilateral cerebellum and medulla of stutterers.

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Conversely, stutterers exhibited increased gray matter volume in the bilateral superior temporal, middle temporal, precentral, postcentral gyrus, and inferior parietal lobule.

These findings suggest that reduced gray matter in speech production control areas is linked to the neural mechanisms of stuttering, while increased volumes in other regions may indicate functional compensation.

Impact:

The study identifies specific brain regions associated with the neural mechanisms of stuttering, particularly the cerebellum and medulla.
Findings suggest that increased gray matter in temporal, parietal, and frontal lobes may be a compensatory response to functional deficiencies in speech control areas.
This research provides a neuroanatomical basis for understanding stuttering and may inform future therapeutic strategies aimed at improving speech fluency.