Simultaneous MEG-LFP Recordings to Assess In Vivo Dystonic Neurophysiological Networks: A Feasibility Study
Elisa Visani1, Lorenzo Bergamini2, Chiara Gorlini2
1SC Epilettologia Clinica e Sperimentale, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, 20133 Milan, Italy.
Simultaneous magnetoencephalography (MEG) and local field potential (LFP) recordings are feasible in dystonia patients, offering high-quality signals for studying brain network dynamics. Synchronization methods were effective, paving the way for advanced research into dystonia.
Area of Science:
- Neuroscience
- Biomedical Engineering
Background:
- Subcortical local field potentials (LFPs) are crucial for understanding the dystonia network's in vivo neurophysiology.
- Deep Brain Stimulation (DBS) devices allow LFP recording, enabling combined analysis with whole-head techniques like magnetoencephalography (MEG) to explore cortical-subcortical interactions.
- Simultaneous LFP-MEG acquisition presents challenges, including DBS device interference and synchronization complexities.
Purpose of the Study:
- To assess the feasibility and signal quality of concurrent local field potential (LFP) and magnetoencephalography (MEG) recordings in dystonia patients.
- To evaluate two synchronization strategies for aligning LFP and MEG signals during simultaneous acquisition.
- To determine the impact of simultaneous recording on the quality of MEG signals.
Main Methods:
- Simultaneous MEG-LFP recordings were conducted in 11 patients with inherited or idiopathic dystonia who had undergone bilateral Globus Pallidus Internus (GPi) Deep Brain Stimulation (DBS) lead implantation.
- Two synchronization methods were tested: the Tapping method (using an accelerometer on the DBS device) and the Stimulation method (using sham stimulation artifacts).
- Signal-to-noise ratio (SNR) was analyzed post-implantation to assess MEG signal quality.
Main Results:
- Both the Tapping and Stimulation methods successfully aligned MEG and LFP signals, with mean temporal delays of 91 ± 22 ms and 288 ± 166 ms, respectively.
- Post-implantation SNR analysis showed slight degradation but no significant impact on MEG quality for both gradiometers and magnetometers.
- Temporal alignment accuracy improved with practice, indicating a potential learning curve for the synchronization methods.
Conclusions:
- Simultaneous MEG-LFP recordings in dystonic patients are feasible and yield high-quality, reliably synchronized signals.
- This combined recording approach offers new avenues for investigating cortical-subcortical dynamics in dystonia.
- The findings support the potential of integrating MEG and LFP recordings for advancing dystonia research.
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