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Examining Local Network Processing using Multi-contact Laminar Electrode Recording
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Discrepancies between Multi-Electrode LFP and CSD Phase-Patterns: A Forward Modeling Study.

Rikkert Hindriks1, Xerxes D Arsiwalla2, Theofanis Panagiotaropoulos3

  • 1Computational Neuroscience Group, Department of Information, Center for Brain and Cognition Barcelona, Spain.

Frontiers in Neural Circuits
|July 30, 2016
PubMed
Summary
This summary is machine-generated.

Local field potential (LFP) phases differ from current source density (CSD) phases due to oscillation frequency and laminar profiles. The Laplacian montage minimizes these discrepancies in neural recordings.

Keywords:
current source density (CSD)forward modelinglocal field potential (LFP)neural oscillationsphase-dynamicstraveling wavevolume conduction

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Electrophysiology

Background:

  • Multi-electrode recordings of local field potentials (LFPs) are crucial for studying spatiotemporal neural activity and oscillations.
  • LFP phases are used to investigate neural oscillation coordination and its link to cognitive processes.
  • The relationship between LFP phases and the underlying current source density (CSD) phases is critical for accurate interpretation but often assumed.

Purpose of the Study:

  • To characterize discrepancies between LFP and CSD phase patterns using a volume-conductor model.
  • To identify factors contributing to LFP-CSD phase discrepancies.
  • To assess the impact of different electrode montages on LFP-CSD phase relationships.

Main Methods:

  • Utilized a volume-conductor model to simulate and analyze LFP and CSD phase patterns.
  • Focused on cortical LFPs recorded with two-dimensional (Utah) arrays.
  • Investigated the influence of oscillation frequency, laminar CSD profile balance, and electrode montages (average-reference, referential, Laplacian).

Main Results:

  • Discrepancies between LFP and CSD phases are primarily determined by oscillation frequency and the balance of the laminar CSD profile.
  • Laminar phase differences in cortical oscillations prevent direct identification of LFP phases with CSD phases at specific depths.
  • The average-reference montage showed larger LFP-CSD phase discrepancies compared to the referential montage; the Laplacian montage minimized these discrepancies.

Conclusions:

  • Directly equating LFP phases with CSD phases is problematic, potentially complicating interpretations of spike-LFP coherence and spike-triggered averages.
  • Electrode montage significantly influences the observed LFP phase patterns relative to underlying CSDs.
  • The Laplacian montage is recommended for analyzing two-dimensional LFP recordings to reduce LFP-CSD phase discrepancies.