[Eeglablist] Calculation of frequency power centroid for a specific band

[Arnaud Delorme]

Dear David,

maybe you could also try a small script. 
The script below calculates the spectrum and find the max between 8 and 12 Hz for channel 1

figure; [spec freq ] = pop_spectopo(EEG, 1, [EEG.xmin EEG.xmax]*1000, 'EEG' , 'percent', 15, 'freqrange',[2 25],'electrodes','off');
[tmp f1] = min(abs(freq-8));
[tmp f2] = min(abs(freq-12));
[tmp indmax] = max(spec(1,f1:f2))

freq(f1+indmax-1)

ans =

   11.1850

Hope this helps,

Arno

On 27 Oct 2012, at 16:08, Simon-Shlomo Poil wrote:

> Dear David,
> 
> I don't think you can calculate the dominant frequency directly in
> EEGLAB. However, you can using a plugin the Neurophysiological
> Biomarker Toolbox (http://www.nbtwiki.net). Unfortunately we do not
> yet have a tutorial on how you calculate the dominant frequency, but
> you simply use the menu Compute Biomarkers | For multiple NBT signal |
> Spectral Biomarkers in the NBT menu.
> 
> That will generate a nbt_PeakFit biomarker with many different
> spectral measures. One of then is CentralFrequency. Which is the
> "dominant frequency" in different frequency bands, it will also tell
> you the power of this frequency in CentralPower.
> 
> You can also call the function directly, it's called nbt_doPeakFit
> 
> Best regards,
> Simon
> 
> --
> Simon-Shlomo Poil
> 
> 
> 2012/10/26 David Gilbert <dgilbert at siu.edu>:
>> How can one Calculation of frequency power centroid for a specific band in
>> EEGLAB. For example, the dominant frequency (actually centroid frequency)
>> for alpha?
>> Thanks,
>> Dave Gilbert
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