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Related Experiment Videos

Brain electrical field measurements unaffected by linked earlobes reference.

S L Gonzalez Andino1, R D Pascual Marqui, P A Valdes Sosa

  • 1Neurosciences Branch, National Center for Scientific Research, Havana, Cuba.

Electroencephalography and Clinical Neurophysiology
|March 1, 1990
PubMed
Summary

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Linking earlobes in electroencephalography (EEG) may distort readings, invalidating norms. However, this study found no significant differences, suggesting high skin impedance mitigates distortion effects in EEG measurements.

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Quantitative electroencephalography (qEEG) norms may be invalidated by theoretical distortions from linked earlobe references.
  • A low-resistance path across linked earlobes could significantly alter measured electrical fields.

Purpose of the Study:

  • To investigate the potential distortion of EEG signals caused by linked earlobe references.
  • To assess whether this distortion invalidates established quantitative EEG norms.

Main Methods:

  • EEG recordings were obtained from 4 patients with unilateral lesions, comparing linked and unlinked earlobe references.
  • Statistical analyses were performed to detect significant differences between the two recording conditions.
  • Equivalent circuit analysis was used to model the electrical properties of the reference system.

Related Experiment Videos

Main Results:

  • Statistical tests showed no significant differences in EEG recordings between linked and unlinked earlobe references.
  • Equivalent circuit analysis indicated that high skin/electrode impedance renders the linked ear reference functionally similar to an ordinary reference.

Conclusions:

  • The theoretical distortion of EEG signals by linked earlobe references appears to be negligible in practice.
  • High skin/electrode impedance effectively neutralizes the potential distorting effect, preserving the validity of quantitative EEG norms.