Dear SPM community,
I have a basic question regarding VBM analysis with the new "longitudinal registration" procedure of spm12b.
I would like to compare volumetric difference after a training procedure (pairwise registration between two time point). Each subject perform a 14 days of training. The time between to scans vary for each participant due to scanner availability (e.g 27, 20, 15, ... days).
In the longitudinal registration batch, which duration should I enter in the "Time Difference" ? The duration of the training (which are the same for every one) or the actual time between difference between two scans (different for each subject) ?
Thanks
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