Dear Vladimir and SPM users,
I am using the beamformer (EBB) provided by SPM12 as a source reconstruction method for my MEG results (sliding time window of 50ms from 100-600 post-stimulus onset).
I am getting a strong, widespread, and long-lasting (from 100-600ms after stimulus presentation) activation (pcorr < 0.05) centred in the thalamus (see attached), which makes me think that beamforming is failing (spurious activation).
However, for each individual source reconstruction, the variance explained is >85%, and the log evidence ranges from -9000 to -12000. Are these values expected in case of beamformer failure? If not, does anyone have any ideas what might be the issue?
Thank you very much for your help,
Veronica
|