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How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging
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Subcortical electrophysiological activity is detectable with high-density EEG source imaging.

Martin Seeber1, Lucia-Manuela Cantonas1, Mauritius Hoevels2

  • 1Functional Brain Mapping Laboratory, Department of Fundamental Neurosciences, Campus Biotech, University of Geneva, 1201, Geneva, Switzerland.

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Scalp electroencephalography (EEG) can detect subcortical brain signals. This study shows EEG can sense activity from deep brain structures like the thalamus and nucleus accumbens.

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Area of Science:

  • Neuroscience
  • Brain-computer interfaces
  • Electrophysiology

Background:

  • Subcortical neuronal activity is crucial for large-scale brain network communication.
  • Electroencephalography (EEG) offers high temporal resolution for brain dynamics but its ability to detect subcortical signals is debated.

Purpose of the Study:

  • To investigate if scalp EEG can detect and localize signals from subcortical brain regions.
  • To assess the feasibility of using externalized deep brain stimulation (DBS) electrodes for simultaneous subcortical and EEG recordings.

Main Methods:

  • Utilized high-density (256-channel) scalp EEG recordings.
  • Simultaneously recorded from externalized DBS electrodes in the centromedial thalamus and nucleus accumbens.
  • Analyzed correlations between intracranial and source-reconstructed EEG signals during rest.

Main Results:

  • Found significant correlations between alpha envelopes from intracranial and EEG source-reconstructed signals.
  • Observed the highest correlations for EEG signals closest to the actual DBS electrode locations.
  • Provided direct evidence for scalp EEG's capability to sense subcortical signals.

Conclusions:

  • Scalp EEG can detect and localize subcortical brain activity.
  • This finding has implications for non-invasive brain monitoring and brain-computer interfaces.