Dear SPM users,
could anyone tell me how the effect of interest is defined in SPM2:
is it the one specified by SPM.xX.iC, or is it everything that is NOT
specified by SPM.xX.iB and SPM.xX.iG ?
The reason I am asking is that I used batch mode to process my group
fMRI data as a fixed-effect model with realignment parameters included
as regressors of no interest. Therefore I specified SPM.xX.iG to mark
the effect of no interest, but somehow forgot to change SPM.xX.iC (that
now contain all columns including those specified in SPM.xX.iG).
Unfortunately I noticed that my mistake only after I had completed all
the long-lasting computations, so I am wondering did I make a critical
mistake or not? Specifically, did it lead to wrong AR(1) estimation?
thank you!
Victor
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Victor Vorobyev, Ph.D.
Centre for Cognitive Neuroscience
University of Turku
Finland
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