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Magnetoencephalographic Infraslow Activity: A Feasibility Study.

Ernst A Rodin1, Samu J Taulu, Michael E Funke

  • 1*Department of Neurology, University of Utah, Salt Lake City, Utah, U.S.A.; †Department of Physics, Institute for Learning & Brain Sciences, University of Washington, Seattle, Washington, U.S.A.; ‡Department of Pediatrics, University of Texas, Houston, Texas, U.S.A.; §Department of Psychiatry, University of Utah, Salt Lake City, Utah, U.S.A.; ‖BESA GmbH, Graefelfing, Germany; and ¶Intermountain Neurosciences Institute, Murray, Utah, U.S.A.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|December 23, 2015
PubMed
Summary

Background infraslow activity (ISA) can be detected in archived magnetoencephalographic (MEG) recordings and shows clinical relevance in epilepsy patients. This normal brain activity segment warrants further investigation for its role in health and disease.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Biomedical Engineering

Background:

  • Infraslow activity (ISA) is a low-frequency brain signal.
  • Archived magnetoencephalographic (MEG) and electroencephalography (EEG) data are valuable resources.
  • Understanding normal brain activity is crucial for diagnosing neurological disorders.

Purpose of the Study:

  • To determine if infraslow activity (ISA) can be retrieved from archived magnetoencephalographic (MEG) recordings.
  • To explore the potential clinical relevance of ISA detected via MEG.
  • To compare ISA and delta band activity in epilepsy patients and healthy subjects.

Main Methods:

  • Analysis of archived MEG and EEG recordings from 15 epilepsy patients and 10 controls.
  • Utilized a Neuromag/Elekta system with 204 planar gradiometers, 102 magnetometers, and 60 EEG channels.
  • Applied temporal signal space separation filtering for artifact removal and BESA Research software for data analysis.

Main Results:

  • Infraslow activity (ISA) was detected in all MEG and EEG recordings.
  • Concordance observed between EEG and MEG ISA for laterality and clinical features, particularly with delta frequencies (<2 Hz).
  • An inverse relationship between delta and ISA during sleep was noted; ISA decreased as delta increased with deeper sleep.

Conclusions:

  • Infraslow activity (ISA) is a normal component of the cerebral electromagnetic spectrum.
  • ISA exhibits physiological rules and can be associated with pathological areas.
  • Further research into the origin and changes of ISA in health and disease is recommended, aligning with prior EEG findings.