Hi Will,
You need regressors to model the session effects. The latest release of SPM includes a function to generate these. I've just added a Wiki page on this - https://en.wikibooks.org/wiki/SPM/Concatentation .
Best,
P
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Will Gibson
Sent: 06 July 2015 18:25
To: [log in to unmask]
Subject: [SPM] run concatenation for dcm
Hello all - I have been advised to concatenate within-subject runs in order to perform DCM analysis (i.e. to test the effect of a modulatory input which was present in one run, but not in the other). However, I am noticing that the baseline signal intensity has shifted somewhat between the two runs, so that when I pull out the time course data, there is a "jump" from one set of data points to the next. Will this cause a problem with the analysis? if so, how should one deal with this? Thank you. -Will
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