The Wavelet Digest Homepage
Return to the homepage
Search the complete Wavelet Digest database
Help about the Wavelet Digest mailing list
About the Wavelet Digest
The Digest The Community
 Latest Issue  Back Issues  Events  Gallery
The Wavelet Digest
   -> Volume 6, Issue 4


Thesis: Time-Frequency Analyses of EEG
 
images/spacer.gifimages/spacer.gif Reply into Digest
Previous :: Next  
Author Message
durka@fizmed1.fuw.edu.pl (Piotr Durka)
Guest





PostPosted: Tue Mar 25, 1997 12:54 pm    
Subject: Thesis: Time-Frequency Analyses of EEG
Reply with quote

#10 Thesis: Time-Frequency Analyses of EEG

PhD thesis: "Time-Freqency Analyses of EEG"
by Piotr J. Durka, Warsaw University.

Abstract:

Proper description of the electroencephalogram (EEG) often requires
simultaneous localization of signal's structures in time and
frequency. We discuss several time-frequency methods: windowed
Fourier transform, wavelet transform (WT), wavelet packets, wavelet
networks and Matching Pursuit (MP). Properties of orthogonal WT are
discussed in detail. Advantages of wavelet parameterization, including
fast calculation of band-limited products, are demonstrated on an
example of input preprocessing for feedforward neural network learning
detection of EEG artifacts.
MP algorithm finds sub-optimal solution to the problem of optimal linear
expansion of function over large and redundant dictionary of
waveforms. We construct a method for automatic detection and analysis
of sleep spindles in overnight EEG recordings, based upon MP with real
dictionary of Gabor functions. Each spindle is described in terms of
natural parameters. In the same way the slow wave activity (SWA) is
parametrized. In this framework several of reported in literature
hypotheses, regarding spatial, temporal and frequency distribution of
sleep spindles, and their relations to the SWA, are confirmed. We
present also an application to automatic detection and spatial
analysis of superimposed spindles. Finally, owing to its high
sensitivity, proposed approach allows the first insight into the issue
of low amplitude spindles, undetectable by the methods applied up to
now.

Contains 97 pages, 36 figures. PostScript file comes in four flavors:
prepared for double- or single-sided printing and compressed as Unix *.Z
or DOS *.zip. Available via http://info.fuw.edu.pl/~durka my Web page,
or ftp://brain.fuw.edu.pl/pub/
All times are GMT + 1 Hour
Page 1 of 1

 
Jump to: 
 


disclaimer - webmaster@wavelet.org
Powered by phpBB

This page was created in 0.026329 seconds : 18 queries executed : GZIP compression disabled