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EEG coherence or EEG correlation?

M A Guevara1, M Corsi-Cabrera

  • 1Facultad de Psicología, Universidad, Nacional Autónoma de México, México, D.F., México.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|October 1, 1996
PubMed
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Electroencephalographic correlation (r) and coherence (Coh) analyses show high comparability in brain functional studies. Despite differences, both methods yield similar results under normal physiological conditions with quality recordings.

Area of Science:

  • Neuroscience
  • Signal Processing

Background:

  • Electroencephalography (EEG) is crucial for studying brain functional relationships.
  • Correlation (r) and coherence (Coh) are widely used EEG analysis methods, often considered equivalent.

Purpose of the Study:

  • To compare the results obtained from correlation (r) and coherence (Coh) EEG analyses.
  • To identify differences and similarities between r and Coh methods in assessing brain functional connectivity.

Main Methods:

  • Comparison of r and Coh spectra using artificially manipulated 2 Hz sinusoidal signals.
  • Analysis of r and Coh spectra from EEG recordings during different sleep stages (wakefulness, stage 2, 4, paradoxical sleep) across various derivations (C3, C4, F3, F4, T3, T4).
  • Statistical analyses including Pearson product-moment coefficients, principal component analyses, and two-way ANOVAs.

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Main Results:

  • High significant Pearson coefficients (0.86-0.96 interhemispheric, 0.60-0.90 intrahemispheric) between r and Coh spectra.
  • Principal component analyses revealed similar frequency band formations for both r and Coh spectra.
  • Two-way ANOVAs showed comparable results for r and Coh across physiological stages and derivations.

Conclusions:

  • A high degree of comparability exists between electroencephalographic correlation (r) and coherence (Coh) analyses.
  • Both methods provide similar insights into brain functional relationships under normal physiological conditions.
  • The study confirms the utility of both r and Coh for EEG-based functional connectivity research.