Research on the electrical activity of the brain (electroencephalogram, EEG) has over a 100 years history - with Polish scientists among the pioneers. In spite of a rapid development of new brain imaging systems, EEG still retains a privileged position. With greatly improved recording techniques, analysis of these data poses nowadays a major challenge. New signal processing techniques (adaptive approximations) are suitable for analysis of non-stationary signals and provide time-frequency resolution, superior to any of the previously known methods. A unified parametrization of transient and stationary phenomena is possible within the presented framework.
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