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   -> Volume 7, Issue 6

Preprint: Wavelet analysis of epileptic EEG
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"Piotr Wojdyllo" (

PostPosted: Thu Jun 18, 1998 6:10 pm    
Subject: Preprint: Wavelet analysis of epileptic EEG
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#6 Preprint: Wavelet analysis of epileptic EEG

1. Title: Wavelets, rough sets and artificial neural networks
in EEG analysis

Author: Piotr Wojdyllo

Abstract: We present a method for processing of epileptic EEG signals
by means of wavelets, rough set based algorithms and neural networks.
Rough set methods were developed in last 15 years since theoretical
works of prof. Z. Pawlak. To apply rough set methods I used RSES
library developed under direction of prof. A. Skowron in Group of
Mathematical Logic, Institute of Mathematics, Warsaw University.
Problem of discerning between posttraumatic epilepsy and other causes
of epilepsy by means of EEG scores is believed by physicians to be
unsolvable. The hybrid approach makes problem of discerning between
posttraumatic epilepsy and other causes of epilepsy solvable and
results are promising. To describe the results, known objects are used
to teach the system, then we test our system on the unknown objects.
In physician language, presented below parameters are specificity and
sensitivity resp. of detection of posttraumatic epilepsy. Results of
some experiments are presented here.

1. Known objects are classified with perfect accuracy (100%) in both groups
(posttraumatic/ endogenic).
2. Unknown objects (20% of population) are classified with correctness:
posttraumatic endogenic
85% 69% ,
84% 64% ,
75% 56% or
68,5% 67%
depending on methods of analyzing data.
In the paper also plan of further research is given.

To appear in: Proceedings of 1st International Conference on Rough
Sets and Current Trends in Computing WARSAW 1998,
Lecture Notes in Computer Science, Springer Verlag

2. Title: Why a wavelet is a wavelet?

Author: Piotr Wojdyllo

Abstract: Short and easy proof of Mallat theorem about a wavelet obtained
from multiresolution analysis and formula for wavelet. Accesible even for
first- or second year students. No Fourier transform.

Papers are available by request to the author.

Piotr Wojdyllo
Institute of Mathematics, Warsaw University
Banacha 2 02-097 Warsaw POLAND
All times are GMT + 1 Hour
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