Hi
I have a question about group level factorial analysis
in SPM and I was wondering if anyone can advise me.
I am trying to run a group level analysis now. The subjects are
divided into 3 groups (CON AND 2 PAT) and for each patient there are
two task conditions. I have run a PPI analysis from seed to whole
brain for each subject for each condition. This works the same as task
based analysis
For my group level analysis I am trying to ask the question: which
brain regions are significantly more activated in group 1
compared to group 2 and in group 2 compared to group 3 (group 1 >
group 2 > group 3) in condition A minus B.
I have set up a full
factorial with three groups & two conditions. I am looking at the
contrasts 1 -1 0 0 -1 1 as (condition 1 - condition 2 for group A) -
(condition 1 - condition 2 for group C), with group B being modelled
implicitly).
Is this correct for this purpose? If not, how would you interpret this
contrast 1 -1 0 0 -1 1? And how would you set up a contrast to ask the
question
I would be extremely grateful for any pointers
Sincerely
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Prerona Mukherjee
Post Doctoral Research Associate
Stonybrook University
Department of Psychiatry
Putnam Building, Room 142 A
Work: 631 632-8894
Mobile: 773 916 7662
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