Make spectrogram of LFP using chronux package

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Hello! I am trying to get a spectrogram of some LFP signals using the chronux package.
My current code is:
[S,t,f] = chronux.ct.mtspecgramc(data, [.4 .0005], params);
S = 10*log10(S);
imagesc(t,f,S)
Because the data is sleep LFP, I should be getting a spectrogram with red on the bottom throughout, but instead, it's looking like this:
Does anyone know what I am doing incorrectly?

Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 5 Jul 2022
From the help of that function you will see that the output S should be:
0050 % S (spectrum in form time x frequency x channels/trials if trialave=0;
0051 % in the form time x frequency if trialave=1)
0052 % t (times)
0053 % f (frequencies)
0054 % Serr (error bars) only for err(1)>=1
Therefore the correcter way of displaying the spectrogram would be:
pcolor(t,f,S.'),shading flat,colorbar,xlabel('time'),ylabel('freq')
HTH

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