Dear SPM users,
I'm actually confused about the VOI extraction for DCM in a multisession
design (in my particular case I have 4 sessions, which are all
replications with counterballanced order of blocks).
As far as I understood, it's not resonable to extract VOIs session wise
for DCM. The much more appropriate way to do this seems to be the
concatination over all sessions into one. But I sadly couldn't find any
manual, guideline or script for the concatination procedure.
Would it be correct, if I put all the sessions into one and then add 4
regressors (filled with ones) indicating each session separately? How in
this case the contrasts should look like?
I would be very grateful if someone could provide a solutioun how to
extract one VOI over multiple sessions.
It would be also very helpful to get an example for a design matrix for
a correctly concatinated sessions.
Many thanks in advance!
Best regards,
Jewgeni
|