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A Fine Motor Task to Study Joint Kinematics in a Preclinical Model of Neurodegenerative Disease

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Synchronized brain network underlying postural tremor in Wilson's disease.

Martin Südmeyer¹, Bettina Pollok, Harald Hefter

¹Department of Neurology, Heinrich Heine University, Düsseldorf, Germany.

Movement Disorders : Official Journal of the Movement Disorder Society

|September 23, 2006

Summary

Wilson's disease (WD) causes tremors due to abnormal brain network activity. This study reveals a synchronized cerebello-thalamo-cortical network, including the primary sensorimotor cortex, involved in generating WD postural tremors.

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Area of Science:

Neuroscience
Neurology
Systems Neuroscience

Background:

Wilson's disease (WD) commonly presents with neurological symptoms, notably postural tremors in the upper extremities.
While primary sensorimotor cortex (S1/M1) involvement in tremor generation is recognized, neuropathological changes in WD predominantly affect subcortical structures.
Understanding the functional connectivity of S1/M1 in WD is crucial for elucidating tremor pathophysiology.

Purpose of the Study:

To investigate functional interconnections between the primary sensorimotor cortex (S1/M1) and other brain regions in Wilson's disease (WD) patients with postural tremor.
To identify the specific brain network involved in the generation of WD postural tremor.

Main Methods:

Magnetoencephalography (MEG) and surface electromyography (EMG) were used to simultaneously record cerebral neuronal and muscular activity.
Five WD patients were studied during a sustained forearm posture task.
Cerebro-cerebral coherence at tremor frequency and its harmonic was analyzed, with S1/M1 serving as a reference area.

Main Results:

The strongest coupling to tremor EMG was confirmed in the contralateral S1/M1.
Significant oscillatory coherence was found within a network including S1/M1, premotor cortex (PM), supplementary motor area (SMA), posterior parietal cortex (PPC), contralateral thalamus, and ipsilateral cerebellum.
Information flow within this network was predominantly bidirectional.

Conclusions:

Wilson's disease postural tremor arises from a synchronized cerebello-thalamo-cortical network.
This network involves S1/M1, higher motor cortical areas (SMA, PM), PPC, thalamus, and cerebellum.
The findings highlight the complex interplay of brain regions in WD tremor generation.