Dear Markus,
> we would prefer to design a "simple" contrast model at the first step with a
> column for each factor and level (=12 columns).
> would it be appropriate to
> a) model the interaction between the 3 factors in this design?
> b) or to perform the "baseline" contrasts and transfer the resulting 8
> con-images into a second factorial design (with a 2x2x2 design).
If I got it right, you are not interested in the baseline but in the differences against the baseline, isn't it?
So, in this case, I would suggest b), where you create the difference contrasts on the first level.
Good luck,
Karsten
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Karsten Specht, PhD
Department of Biological and Medical Psychology
& National Competence Centre for functional MRI
University of Bergen
Jonas Lies vei 91
5009 Bergen
Norway
Tel.: +47-555-86279
Fax: +47-555-89872
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http://fmri.uib.no/
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