[Eeglablist] Alpha band extraction from spectopo

[Arnaud Delorme]

Dear Nikos,

yes, you can. For instance to plot alpha power scalp map between 9 and 11 Hz, you may type

figure; [spectrum freqs] = pop_spectopo(EEG, 1, [EEG.xmin EEG.xmax]*1000, 'EEG' , 'percent', 100, 'freq', [6 10 22]);
[tmp minind] = min(abs(freqs-9));
[tmp maxind] = min(abs(freqs-11));
alphaPower = mean(spectrum(:, minind:maxind),2);
figure; topoplot(alphaPower, EEG.chanlocs, 'maplimits', 'maxmin'); cbar;

Best regards,

Arno

On Jun 19, 2011, at 7:25 AM, nikos dhmou wrote:

> Hello, I would like to ask how can I extract the alpha band power spectrum only from spectopo. I get a vector of spec of 513 values when I use spectopo for a set of epochs in a condition which represent frequencies up to 250 hz.
> 
> Thanks,
> nikos
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