Hi SPM list (and apologies if this is a double post)
I'm doing source localisation on my MEG data (MSP currently as it gives better log evidence compared to IID and COH) and have fMRI data that can be used as a prior. I've noticed that for some participants when using a prior the log evidence increases quite dramatically, but for others (co-incidentally enough those who show less activation in fMRI...), the evidence decreases and can be worse than simply using MSP alone.
My question is, it "acceptable" to use priors for some participants but not others?
Thanks for any help,
Peter.
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