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Related Experiment Videos

Cardiac field effects on the EEG

G Dirlich1, L Vogl, M Plaschke

  • 1Max Planck Institute of Psychiatry, Clinical Institute, Munich, Germany. dirlich@mpipsykl.mpg.de

Electroencephalography and Clinical Neurophysiology
|April 1, 1997
PubMed
Summary
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The electrical field of the heart creates a significant artifact in scalp recordings during electroencephalography (EEG) averaging. Understanding and removing this electrocardiac artifact is crucial for accurately studying brain potentials coordinated with the heart cycle.

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Cardiology

Background:

  • The heart's electrical field extends throughout the body, influencing scalp potentials.
  • These cardiac-induced potentials can interfere with electroencephalography (EEG) measurements, particularly during heart cycle-related averaging.
  • High-amplitude artifacts obscure underlying brain electrical signals.

Purpose of the Study:

  • To investigate the topographic and temporal characteristics of the electrocardiac artifact in scalp EEG.
  • To assess the impact of head movements on the cardiac field artifact.
  • To explore strategies for separating cardiac artifacts from brain potentials.

Main Methods:

  • Measured scalp potentials and their distribution in 9 healthy subjects.

Related Experiment Videos

  • Investigated the influence of head-turning on the cardiac electrical field artifact.
  • Compared scalp potentials with computed vector electrocardiography (ECG) to understand the artifact's 3D nature.

    • Main Results:

    • The electrocardiac artifact was most prominent during the QRS complex and T wave of the cardiac cycle.
    • The artifact exhibited distinct asymmetry between cerebral hemispheres.
    • The 3D nature of the artifact was confirmed by comparing scalp potentials with vector ECG.

    Conclusions:

    • The cardiac electrical field generates a significant, asymmetrical artifact in scalp EEG.
    • Head position influences the cardiac field artifact.
    • Effective separation of cardiac artifacts is essential for studying heart cycle-coordinated brain potentials.