[Mne_analysis] Unbalanced number of trials between individuals: problem in sources

[Laetitia Grabot]

Dear MNE-users,

I am aware of the fact that when contrasting two conditions, the epochs
within each condition should be equalized before reconstructing in source
space, otherwise the SNR would be different between the two conditions.
That also means that if two subjects have a different number of epochs, the
SNR of each subject will be different. It is often the case that the number
of epochs doubled between subjects (50 vs. 100) so I guess that it is an
issue when looking at group averaged stc for instance.
A possible solution would be to normalize the stc to correct for the number
of trials. What do you think of that? What would be the proper
normalization?

Thanks,
Best,
Laetitia G.
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