When one performs a multisession fMRI analysis with SPM, in either its
SPM96 or SPM99 incarnation, my guess is that SPM removes intersession
effects, perhaps behind the scenes. If this is so, if each session were
a different subject, and if one tried to use the subjects' age (rounded
to the nearest year) as a confound in the analysis, would this result in
a problem of linear dependence in the columns of the design matrix?
Thanks,
Joe.
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