Thanks Alfonso, that helps a lot!
May I ask another question? I was also wondering if the way that within-subject analysis as performed in conn is the same as paired-t-tests in spm?
because in the design matrix I got only one column for the pre vs post effect and one CON.nii file per subject (are those correspond to the residual error or the within-subjects effect?), also the results should not be exactly the same as in spm since the number of dof is different? (i.e., only one regressor in conn vs two or one per condition + one per subject in spm)?
Many thanks
Best
Pauline