Abnormalities in grey matter structure in embouchure dystonia

Area of Science:

• Neuroscience
• Movement Disorders
• Medical Imaging

Background:

• Embouchure dystonia (ED) is a movement disorder affecting brass musicians, causing involuntary spasms.
• Previous research noted functional changes in sensorimotor and auditory networks in ED patients.

Purpose of the Study:

• To investigate structural brain differences in grey matter volume and asymmetry.
• Compare ED patients, healthy musicians, and nonmusicians using MRI.

Main Methods:

• High-resolution structural MRI scans were acquired from 24 ED patients, 23 healthy musicians, and 24 nonmusicians.
• Voxel-wise morphometry and asymmetry analyses were performed.
• Region-of-interest volumetry and correlation with clinical data were conducted.

Main Results:

• ED patients exhibited increased grey matter volume in the primary sensorimotor cortex compared to controls.
• Both healthy and ED musicians showed increased thalamic symmetry versus nonmusicians.
• ED patients displayed increased basal ganglia symmetry; disease duration correlated inversely with putaminal volume and basal ganglia asymmetry.

Conclusions:

• This study provides evidence for structural abnormalities in task-specific orofacial dystonia.
• Sensorimotor cortex changes suggest maladaptive plasticity in ED.
• Subcortical asymmetry changes in musicians may play a role in focal dystonia.