Local Field Potentials in Movement Disorders: A Narrative Review

Area of Science:

• Neuroscience
• Biomarkers
• Neuromodulation

Background:

• Local field potentials (LFPs) reflect summed neuronal activity, offering insights into brain network dynamics.
• Advances in deep brain stimulation (DBS) and sensing technology highlight LFPs as key biomarkers for movement disorders and neuromodulation.
• LFPs are essential for understanding synaptic and oscillatory dynamics across brain networks.

Purpose of the Study:

• To review the role of LFPs in movement disorders, covering methodology, functional characterization, disease-specific findings, and clinical applications.
• To synthesize current evidence on LFP biomarkers for various movement disorders.
• To explore the clinical utility of LFPs in optimizing DBS therapies.

Main Methods:

• Literature review synthesizing evidence on LFPs in movement disorders.
• Analysis of LFP characteristics associated with specific movement disorders (Parkinson's disease, Essential Tremor, Dystonia, Tourette Syndrome, Huntington's disease).
• Examination of clinical applications of LFPs in DBS, including targeting, programming, and monitoring.

Main Results:

• Parkinson's disease (PD) shows exaggerated beta-band activity (STN, GPi) linked to motor symptoms; dyskinesias correlate with gamma activity.
• Essential tremor (ET) exhibits tremor-frequency synchronization in the thalamus; dystonia shows theta/alpha oscillations in GPi.
• Tics and chorea are associated with specific LFP patterns (low-frequency thalamic oscillations, elevated beta-gamma power).

Conclusions:

• LFPs provide crucial insights into disease-specific neural oscillations and serve as reliable biomarkers for movement disorders.
• LFP analysis enhances DBS targeting accuracy, streamlines programming, and improves outpatient monitoring.
• Adaptive DBS (aDBS) utilizing LFP biomarkers is clinically available for PD, offering improved motor control and reduced side effects.