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Pathophysiological Role of Primary Motor Cortex in Essential Tremor
Daniele Birreci1, Luca Angelini2, Giulia Paparella1,2
1Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy.
Summary
Essential tremor (ET) involves primary motor cortex (M1) dysfunction, showing reduced M1 excitability and plasticity. These neurophysiological changes correlate with slower voluntary movements in ET patients.
Area of Science:
- Neuroscience
- Movement Disorders Research
Background:
- Essential tremor (ET) is a common movement disorder with unclear pathophysiology.
- Understanding the role of the primary motor cortex (M1) is crucial for ET research.
Purpose of the Study:
- To investigate the neurophysiological changes in M1 in ET patients.
- To correlate M1 alterations with motor abnormalities in ET.
Main Methods:
- Utilized transcranial magnetic stimulation (TMS) to assess M1 excitability and plasticity in 30 ET patients and 18 healthy controls.
- Measured intracortical excitability and long-term potentiation (LTP)-like plasticity using intermittent theta-burst stimulation (iTBS).
- Performed kinematic analysis of finger-tapping tasks to evaluate voluntary movement execution.
Main Results:
- ET patients demonstrated reduced M1 excitability, intracortical inhibition, and LTP-like plasticity compared to controls.
- Slower finger-tapping performance was observed in ET patients.
- Reduced M1 excitability correlated with decreased finger-tapping velocity in ET patients.
Conclusions:
- Neurophysiological alterations in M1 are present in Essential Tremor.
- M1 excitability changes are linked to impaired voluntary motor control in ET.
- This study offers new insights into ET pathophysiology, highlighting M1's role.
Keywords:
bradykinesiaessential tremormotor controlprimary motor cortextranscranial magnetic stimulationMore Related Videos
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