Increased functional connectivity coupling with supplementary motor area in blepharospasm at rest

Area of Science:

• Neuroscience
• Medical Imaging

Background:

• Blepharospasm (BSP) is a focal dystonia characterized by involuntary muscle contractions.
• Understanding the neural mechanisms underlying BSP is crucial for developing effective treatments.

Purpose of the Study:

• To explore brain function abnormalities in BSP.
• To elucidate the neural mechanisms of BSP using the supplementary motor area (SMA) as a key focus.

Main Methods:

• Resting-state functional MRI (fMRI) was performed on 25 BSP patients and 23 controls.
• Seed-based functional connectivity (FC), correlation analysis, ROC, and SVM were employed to analyze fMRI data.

Main Results:

• BSP patients exhibited altered FC between the SMA and regions including the medial prefrontal cortex (MPFC) and cerebellum.
• Abnormal FC correlated with symptom severity and could differentiate patients from controls with high accuracy (89.58%).

Conclusions:

• Multiple brain networks are implicated in BSP neurobiology.
• The SMA plays a vital role and may be a key pathogenic factor in BSP.