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METHODS OF TIMEFREQUENCY ANALYSIS OF （时间频率分析的方法）.pdf

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METHODS OF TIMEFREQUENCY ANALYSIS OF （时间频率分析的方法）

International Journal of Bioelectromagnetism Vol. 10, No.1, pp. 2 - 16, 2008 Methods for localization of time-frequency specific activity and estimation of information transfer in brain. Katarzyna J. Blinowska Department of Biomedical Physics, Warsaw University.Warszawa, Poland Correspondence: K.J. Blinowska, Department of Biomedical Physics, IFD UW, Hoza 69, 00681 Warszawa, Poland. E-mail: kjbli@.pl, phone + 48 22 6254535, fax; +48 22 5532320. Abstract. The methods of signal analysis in time-frequency space are described. The method of adaptive approximations by matching pursuit decomposes the signal into waveforms characterized by: amplitude, frequency, time occurrence and time span. High resolution time-frequency distributions can be constructed and at the same time parametric description of the signal structures allows for extraction from the data the phenomena of concrete physiological meaning e.g.: sleep spindles, slow waves, epileptic spikes, evoked potentials, etc. These data structures can be used as the input values for inverse solutions. The Directed Transfer Function allows for determination of causal relations between channels of multivariate process. The fully multivariate treatment of the signals (contrary to bivariate approach) allows for the determination of transmission patterns of the brain activity. Short-time Directed Transfer Function makes possible to determine the propagation of brain signals as a function of time and frequency. The applications of both methods to the evaluation of EEG connected with motor and cognitive functions ar