Cortical Potentials Prior to Movement in Parkinson's Disease

Area of Science:

• Neuroscience
• Motor Control
• Parkinson's Disease Research

Background:

• Bereitschaftspotentials (BP) are non-invasive markers of motor cortex activity.
• Assessing BP may reveal drug responses in Parkinson's Disease (PD).
• The effect of anti-PD medications on pre-movement cortical activity in advanced PD remains unclear.

Purpose of the Study:

• To investigate the relationship between Parkinson's Disease (PD) severity and Bereitschaftspotentials (BP).
• To analyze changes in BP components across different stages of PD.

Main Methods:

• Scalp BP recorded at Cz, C3, and C4 sites during self-initiated wrist movements.
• 12 male PD patients (Hoehn and Yahn scale 4) compared with PD patients (scales 2 and 3) and healthy controls.
• Analysis focused on BP waveforms and amplitudes.

Main Results:

• BP waveforms became flatter with increasing PD severity.
• Amplitude reduction was observed even in mild PD compared to controls.
• Early and late components of BP were progressively affected with disease advancement, notably at the Cz site.

Conclusions:

• Increasing PD severity leads to impaired cortical activity, especially in the supplementary motor area, despite dopaminergic medication.
• The dynamic nature of supplementary motor cortex dysfunction in PD requires consideration for advanced treatment strategies.
• Findings suggest potential for BP assessment to monitor disease progression and treatment efficacy.