[Eeglablist] Epoch length with Spectopo
Krogmeier, Claudia M
ckrogmei at purdue.edu
Fri Mar 26 07:15:33 PDT 2021
Would someone be able to comment on this script for computing frontal alpha asymmetry after using spectopo to get the power?
%F3 and F4
[spectraR,freqsR] = spectopo(EEG.data(12,:,:), 0, EEG.srate);
[spectraL,freqsL] = spectopo(EEG.data(3,:,:), 0, EEG.srate);
alphaIdxR = find(freqsR>8 & freqsR<13);
alphaIdxL = find(freqsL>8 & freqsL<13);
% Compute absolute power.
alphaPowerR = mean(10.^(spectraR(alphaIdxR)/10));
alphaPowerL = mean(10.^(spectraL(alphaIdxL)/10));
myFAA = (log(alphaPowerR)-log(alphaPowerL));
In the matlab command line, I see " Computing spectra (window length 256; fft length: 256; overlap 0):"
My srate is 256, but my epochs are 6 seconds. Is the spectra calculated only using one second of my epochs?
Thank you very much for any help,
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