Dear spm and dcm users,
In my first level glm, I used spm_fmri_concatenate('SPM.mat', ScansPerSess) in SPM12 to obtain a single time series per participant for subsequent dcm analysis.
For VOI time series extraction, I followed the instructions here (https://en.wikibooks.org/wiki/SPM/Timeseries_extraction#Manual_timeseries_extraction)
Now, it happens that for one participant, I observe a drop in the baseline activity in my VOI time series in-between fMRI runs (from the last volume of run1 to the first volume of run2, I observe a big drop of the baseline activity). Is such a drop in baseline activity problematic for the dcm analysis and is there a way to correct it?
Many thanks for your help!
Kind regards,
Basil
|