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

[Arnaud Delorme]

Dear Maria,

> 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"/phasecohe/r" 
> function...is it in EEGlab or in Matlab?

No, the best function is "timef" assuming you have data epochs. If you 
do not have data epoch, use directly "fft" or "specgram" from the 
command line. All of these functions return a range of frequency so you 
then have to select specific rows corresponding to specific frequencies, 
the export these in a text file (save -txt filename variablename).

Arno
-- 

*Arnaud Delorme, Ph.D.*
Swartz Center for Computational Neuroscience, INC, University of San 
Diego California
La Jolla, CA92093-0961, USA

*Tel* :/(+1)-858-458-1927 ext 15/
*Fax* :/(+1)-858-458-1847/
*Web page*: sccn.ucsd.edu/~arno <http://www.sccn.ucsd.edu/%7Earno>
*To think upon*:

    The traveler has reached the end of the journey! In the freedom of
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    are thrown away, and the burning fever of life is no more.

        /Dhammapada 90/  

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