AW: [Eeglablist] FFT data with EEGlab, how to get them?

[Sarnthein Johannes]

Dear Maria José,
I do these things with Matlab scripts. For the power spectrum you should use pwelch, it takes care of windowing etc.
You can see the way it is called from EEGLAB in the file spectopo.m
The following command gives you a first look at the spectrum of channel ch=1.
figure;ch=1;pwelch(EEG.data(ch,:),EEG.srate*2,EEG.srate*1,EEG.srate*4,EEG.srate)
A good way to export your data is with xlswrite to Excel
Best,
Johannes

-----Ursprüngliche Nachricht-----
Von: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu]Im Auftrag von Maria Jose' Esposito
Gesendet: Donnerstag, 9. Dezember 2004 09:56
An: eeglablist at sccn.ucsd.edu
Betreff: [Eeglablist] FFT data with EEGlab, how to get them?


Hi everybody,
I've just started to use EEGlab 4.511 on a Matlab 7.0. I'm interested in extract from continuous EEG data (PSG) the  power spectrum of different bands frequencies (that I would like define by myself) from a specific channel, and then to have this data in a format (.txt is ok)  that allow me to export them into another software for statistical analysis.  I've already imported my raw EEG (from an EDF format) into EEGlab an I've done a visual artifacts rejection, but I have some problem in finding a function that allows to define spectral analysis features [e.g. frequency band-withs, spectral resolution (window on analysis, epoch lengh), how to add a cosine window, how to define the ovelapping rate].  I found in EEGlablist message archive that it is possible to do something similar by"phasecoher" function...is it in EEGlab or in Matlab?
Thank you very much.....I'm really looking forward to hearing from someone soon.
m.j. 
_____________________________________________________________________

Maria José Esposito
Dipartimento di Psicologia, Università di Bologna
viale Berti Pichat, 5
40127, Bologna
Italia

Tel: +39-051-2091846/2091878     lab. +39-051-2091826
Fax: +39-051-243086
email: mariajose.esposito2 at unibo.it
          alphadreaming at yahoo.it 
_______________________________________________________________________ 

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