[Eeglablist] Alpha asymmetry spectral analysis

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


Ross:

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.

::brad



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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