[Eeglablist] Alpha asymmetry spectral analysis

Bradley Voytek bradley.voytek at gmail.com
Wed Nov 10 20:49:34 PST 2010


I'll gladly skype chat with you. Much easier to explain that way than over email.

Or if you're going to San Diego for SfN we can chat there.


On Nov 8, 2010, at 19:00, Ross Ávila <ross.avila at gmail.com> wrote:

> Hi everyone,
> I am a graduate student working on an alpha asymmetry study and I am
> struggling with the spectral analysis.
> I have collected 8 minutes of resting EEG divided into 8 60-second
> blocks.  Upon loading the data into EEGLAB, it recognizes a single
> 8-minute long epoch.  I'm just confused about what I need to do at
> this point, and there is no one at the University of South Florida
> that researches alpha asymmetry (they all do ERP studies here).  I
> have little to no experience in MATLAB (part of what appealed to me
> about the EEGLAB interface), so any help in the form of coding might
> need to be "dumbed" down and pretty basic.
> I am struggling specifically with the following questions:
> 1) Do I need to extract epochs? If so, how?
> 2) How do I actually get the alpha asymmetry?  I've read about using
> FFT, but don't know how to actually do this.  Also read about
> "windowing" but again do not understand exactly what this means.
> Any help would be immensely appreciated.
> Thank you,
> Ross
> -- 
> Ross T. Ávila
> Cognitive Neuropsychology Lab
> Doctoral Program in Clinical Psychology
> University of South Florida
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