Dear SPM-Users,
I have a few questions concerning the analysis of PET-studies (with SPM
96). Here is the situation: We have two groups, one of them a control
group and the other one shizophrenia patients. Both have to perform some
kind of Go/noGo-Task against rest. I did a standard analysis
(multi-study with repititions (6 Scans/condition)) and also a
random-effect analysis. To this point everything is fine. Now the
questions:
(i) Is it allowed to define a contrast (-1 1 0 0) in a multy-study
analysis, i.e. one group is activating from rest to the special task
(go/nogo) and the other one shows no signifikant changes ???
(ii) If the answer to the first question is yes, I would conclude that
the contrasts (-1 1 1 -1) and (-1 1 0 0) show those regions, where group
1 shows more activation than group 2. Is that right???
(iii) Is there a possibility to combine two contrasts in something like
a logical ,OR'-connection, i.e. to do an analysis, where group 1 is
activating and group 2 deactivating (-1 1 1 -1) OR group 1 is activating
and group 2 shows no changes (-1 1 0 0) ???
(iv) We are not only interested in the Z-Scores of some clusters, but
also in the results of the regression analysis leading to the Z-Scores,
i.e. BETA and the error of the analysis. What are the possibilities to
extract this numerical data from the analysis/matrices ???
Thank you very much
Laszlo Sturz
Klinik für Nuklearmedizin,
RWTH-Aachen
E-Mail: [log in to unmask]
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