# [Eeglablist] Entropy

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Tue May 5 09:51:40 PDT 2015

```Dear Seetaramaraju,

I have never computed entropy. To compute power,

%%%%%%%%%%%%%%%%%%%
% for your epoched data, channel 2
[spectra,freqs] = spectopo(EEG.data(2,:,:), 0, EEG.srate);

% delta=1-4, theta=4-8, alpha=8-13, beta=13-30, gamma=30-80
deltaIdx = find(freqs>1 & freqs<4);
thetaIdx = find(freqs>4 & freqs<8);
alphaIdx = find(freqs>8 & freqs<13);
betaIdx  = find(freqs>13 & freqs<30);
gammaIdx = find(freqs>30 & freqs<80);

% compute absolute power
deltaPower = mean(10.^(spectra(deltaIdx)/10));
thetaPower = mean(10.^(spectra(thetaIdx)/10));
alphaPower = mean(10.^(spectra(alphaIdx)/10));
betaPower  = mean(10.^(spectra(betaIdx)/10));
gammaPower = mean(10.^(spectra(gammaIdx)/10));
%%%%%%%%%%%%%%%%%

Check also Simon Shlomo-Poil's NBT (and ask them, haha, to make the entropy
measure if they don't have it yet)
http://www.nbtwiki.net/

Makoto

On Tue, Apr 21, 2015 at 12:27 PM, seetaramaraju jampana <
seetaramaraju.jampana at gmail.com> wrote:

> Hi,
>
>     Is there a way to calculate entropy and power of the EEG data for a
> single epoch.
>
> Thanks,
> Raju
>
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--
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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