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Entropy changes in brain function.

Osvaldo A Rosso1

  • 1Chaos and Biology Group, Instituto de Cálculo, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428 Ciudad de Buenos Aires, Argentina. oarosso@fibetel.com.ar

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|January 20, 2007
PubMed
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This study introduces information theory and wavelet transform methods for analyzing electroencephalography (EEG) signals. These quantifiers offer objective analysis of brain activity, improving upon traditional visual inspection methods.

Area of Science:

  • Neuroscience and Biomedical Engineering
  • Signal Processing and Computational Analysis

Background:

  • Traditional electroencephalography (EEG) analysis relies on subjective visual inspection, limiting systematic quantification.
  • Objective analysis of brain electrical activity is crucial for reliable diagnosis and research.

Purpose of the Study:

  • To review and present information theory and wavelet transform-based quantifiers for EEG signal analysis.
  • To demonstrate the application of these methods for quantifying event-related potentials and epileptic EEG records.

Main Methods:

  • Review of information theory quantifiers, specifically "normalized total wavelet entropy".
  • Review of wavelet transform methods, focusing on "relative wavelet energy" for frequency band analysis.
  • Application of these methods to analyze short-duration EEG signals (event-related potentials) and epileptic EEG data.

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Main Results:

  • "Relative wavelet energy" quantifies energy distribution across EEG frequency bands and their importance.
  • "Normalized total wavelet entropy" measures the order-disorder dynamics within multi-frequency EEG signals.
  • These methods provide a systematic and objective approach to EEG analysis.

Conclusions:

  • Information theory and wavelet transform offer robust tools for objective EEG quantification.
  • These methods enhance the analysis of event-related potentials and epileptic seizures.
  • The reviewed quantifiers facilitate a more systematic and reproducible approach to brain electrical activity analysis.