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Related Experiment Videos

Common reference coherence data are confounded by power and phase effects.

G Fein1, J Raz, F F Brown

  • 1University of California, San Francisco.

Electroencephalography and Clinical Neurophysiology
|June 1, 1988
PubMed
Summary
This summary is machine-generated.

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Common reference electroencephalography (EEG) coherence analysis can be misleading due to confounding factors. Researchers recommend caution and reference-free methods for accurate brain function studies.

Area of Science:

  • Neuroscience
  • Signal Processing
  • Biomedical Engineering

Background:

  • Electroencephalography (EEG) coherence analysis is a common method to investigate functional connectivity between cortical regions.
  • High coherence is often interpreted as evidence of neuroanatomic connections.

Purpose of the Study:

  • To illustrate how common reference recordings in EEG coherence analysis can confound results.
  • To demonstrate the significant impact of spectral power and phase on coherence computations.

Main Methods:

  • Analysis of multi-channel EEG data from three subjects.
  • Simulation of spectral power and phase changes in EEG data to observe their effects on coherence.

Main Results:

  • Common reference coherence is susceptible to inflation or deflation due to activity at the reference electrode.

Related Experiment Videos

  • Phase relationships between reference and recording signals significantly modulate power effects on coherence.
  • These power and phase effects vary across frequencies, complicating coherence function interpretation.

    • Conclusions:

    • EEG coherence data obtained with common reference recordings requires extremely cautious interpretation.
    • New EEG coherence data using reference-free recording methods are necessary to accurately determine the utility of EEG coherence analysis for understanding brain function.