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Related Experiment Videos

Topographic analysis in brain mapping can be compromised by the average reference.

J E Desmedt1, C Tomberg

  • 1Brain Research Unit, University of Brussels, Belgium.

Brain Topography
|January 1, 1990
PubMed
Summary

The average reference method in EEG creates false signals by using limited scalp electrodes. This can distort brain mapping results by altering topographical differences.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Electroencephalography (EEG)

Background:

  • The average reference is a common method for analyzing scalp-recorded potentials in EEG.
  • This method can introduce artifacts, known as ghost potential fields, under certain conditions.

Purpose of the Study:

  • To explain the origin of ghost potential fields in average reference EEG.
  • To demonstrate how these artifacts can negatively impact brain potential mapping.

Main Methods:

  • Analysis of scalp-recorded potentials using the average reference method.
  • Investigating the mathematical conditions leading to spurious signals.
  • Evaluating the effect of reference choice on topographical maps.

Main Results:

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  • Ghost potential fields arise when the integral of scalp potentials is non-zero.
  • These artifacts are caused by the limited electrode coverage of the scalp, omitting the lower head half.
  • Arbitrarily re-setting the zero point can obscure or reverse topographical differences, compromising brain mapping.

Conclusions:

  • The average reference method is susceptible to introducing significant artifacts in EEG analysis.
  • These artifacts can lead to misinterpretations of brain activity by distorting topographical maps.
  • Alternative referencing strategies may be necessary for accurate brain mapping.