Hi Anthony,
> I wonder if anyone could help me at all. I wanted to ask a question
> about Tom Nichol's new conjunction tool for SPM. I'd like to know how
> to compute a conjunction on random effects contrasts at a group
> level. Is it so that you do this at the individual subject level
> first and then at a group level? If so I tried this by computing a
> conjunction contrast for one subject as instructed (selecting the
> three contrasts I want to compute a conjunction for) but it didn't
> save a contrast image in the directory i was working in. I am using
> SPM99.
There has been no change to the procedure with Tom's modifications - you
need to run a fixed effects model across all your subjects, and then run
the conjunction across the subject-specific contrasts in the
fixed-effects model.
Best,
Matthew
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