--- Patrizia Vannini <[log in to unmask]> wrote:
> Dear all,
> We have done an fMRI experiment with young and elderly subjects performing
> two different motor tasks. The paradigm is a blockdesign with rest 40s,
> first activation 32s, rest 48s, second activation 40s and rest 56s. I would
> like to perform a 2 way ANOVA in SPM to study the interaction effect of age
> and performance of the two tasks. How should we choose the right contrasts?
> Regards,
>
> Patrizia
I'd like to hear an answer to this one, too; I've got a mixed design myself,
two groups each doing a 2x2 design in an MRI study. I could do a whole bunch of
t-tests but that seems inelegant; I'd rather do an omnibus F test and then
break it down by interactions, main effects and simple effects the way I would
if it were behavioral data.
Is it possible to do a multi-factor ANOVA in SPM99 on MRI data? I keep being
told it's not possible, but I'm not sure if that's true because the statistics
haven't been developed yet, or whether it can be done but the programs aren't
readily available. Or whether it can be done, but it's buried in the Full Monty
section of the PET models...?
Thanks very much,
Jessica Turner
Long Beach VA
Long Beach, CA
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