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Effects of neural synchrony on surface EEG
Simon Musall1, Veronika von Pföstl, Alexander Rauch
1Max Planck Institute for Biological Cybernetics, D-72076 Tübingen, Germany.
Cerebral Cortex (New York, N.Y. : 1991)
|December 14, 2012
Summary
Surface electroencephalography (EEG) signals are influenced by neural activity amplitude and synchrony. This study demonstrates neural synchrony independently modulates EEG, clarifying signal interpretation in neuroscience research.
Area of Science:
- Neuroscience
- Electrophysiology
Background:
- Surface electroencephalography (EEG) signal interpretation is complex.
- Distinguishing contributions of neural amplitude and synchrony to EEG remains challenging.
Purpose of the Study:
- To investigate the independent contributions of neural activity amplitude and spatial synchrony to the surface EEG signal.
- To clarify the relationship between local field potentials (LFPs) and EEG signals.
Main Methods:
- Simultaneous surface EEG and intracortical LFP recordings in nonhuman primates.
- Analysis of EEG power fluctuations in relation to LFP power and interelectrode synchrony.
- Pharmacological manipulations to alter neural activity.
Main Results:
- EEG power fluctuations were explained by a linear combination of LFP power and interelectrode temporal synchrony.
- This effect was prominent in the gamma frequency range (30-100 Hz) and present in both stimulus and stimulus-free conditions.
- Neural synchrony modulated EEG signals independently of LFP amplitude, even causing positive EEG modulation with negative LFP modulation.
Conclusions:
- Neural synchrony is a key factor that can modulate EEG signals independently of amplitude.
- Findings help reconcile discrepancies in EEG interpretation across different spatial scales and modalities (e.g., EEG vs. fMRI).
- Provides a clearer understanding of EEG signal generation for basic and clinical neuroscience.
