how can I extract features in Matlab by DWT from eeg signal for p300 detection usage

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yas yasmini 2016-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/297829-how-can-i-extract-features-in-matlab-by-dwt-from-eeg-signal-for-p300-detection-usage

评论： Savi Gaur 2022-3-30

Hi I'm new on signal processing, I have a small dataset of EEG signal and I want to use DWT for feature extraction for P300 detection. could you please describe me how can I do it in Matlab language? I will be appreciate if explain me by sample code. thanks

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Star Strider 2016-8-4

The last work I did on EEG was more than 20 years ago. Our interest then was to use EEG to determine a laboratory task a subject was doing. We used short-time Fourier transform (similar to the spectrogram function), PCA to identify the best frequencies, and then used that output (with the PCA as a frequency domain filter) as input to the linear classifier, and got very good results. We were one of the first to groups to report this. I then went on to other things. The Prochazka paper uses PCA on time-domain signals, which may make it more difficult to code for real-time analysis (our objective). You might want to explore alternatives.

P300 is an entirely different problem, and beyond my area of expertise. The Hoffmann paper detects P300 by training their classifier on epochs with and without P300, so you will have to do the same. That requires manual segmentation, and then equalizing the lengths of the epoch records.

You will have to experiment with the techniques in the Prochazka paper, and apply the Hoffmann P300 detection techniques. Prochazka uses a simple neural net to do the classification, definitely more robust than our linear classifier. Explaining the DWT here is more than I want to get into. There are several books on it, and the Wavelet Toolbox documentation is excellent but necessarily not encyclopedic. I’ve not used the DWT with EEG.

This should be interesting research. I wish you well.

danyal mehboob 2017-4-24

yas yasmini im engineering student should we start work with help of each othr,it will be good for both,i also want to extract many things from eeg,as final year project