[Mne_analysis] Visualizing power spectrum density of sources on the brain
gladiach at gmail.com
Thu Jun 30 16:49:12 EDT 2016
I have a couple of questions about the psd of sources:
1) I used
stc = mne.minimum_norm.compute_source_psd
to get an stc file containing the psd of the sources. It seems like in
this stc file,
frequency has replaced time, but is still called 'time':
<SourceEstimate | ... tmin : 0.0 (ms), tmax : 55.0 (ms), tstep :
0.25 (ms) ...>
(I set the function to compute from 0 to 55 Hz; the time duration of the data is
actually a lot longer). I can use stc.plot or
mne.plot_source_estimates to visualize this, but it treats
the frequencies like times. How can I plot the psd at a particular
frequency on the brain?
2) What are the units of the psd of the sources? According to the
the psd is in dB,
but what is the reference quantity being used when converting to dB?
(Ie. what is Pref in P_db = 10*log10(P/Pref)?)
Am I right that the source amplitudes are in units of ampere-metres?
Thanks and Best,
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