Hi Laura,
I think you should be able to load in the lower-level directories for stage 3)
Many Regards
Matthew
> Dear FSL List,
>
> I'm analysing an event related dataset consisting of 28 participants with two sessions each.
>
> I have a rather complicated factorial design, with three regressors, two of which with two and one with three levels. Additionally, my subjects are split into two groups (one between subject factor), so my design becomes a
> 2*2*2*3 design.
>
> After trying many different settings and models, I have come up with the following approach.
>
> 1) Run 1 lower level feat full analysis separately for both runs
> with all 28 subjects with 7 EVs (2+2+3), where each EV (3 column design with the onset times for that category) is set to one to test against baseline activation
>
> 2) Run 1st higher level fixed effects analysis using lower level feat directories, with 56 inputs (2*28 subjects) and 28 EVs and 28 contrasts, such that each subject becomes an EV/Contrast (the manner suggested in the feat manual)
>
> 3) Run 2nd higher level analysis using the output of (2)
> Here is my question. Following the FSL FAQ #49, as I understand it, I would have to select "load 3D COPE images" and load 7*28 cope images as input. That's a lot of input ... Can I instead select "use lower level feat directories" as input and load the cope1.feat through cope7.feat directories containing th 28 lower level (subject merged runs) copes?
>
> Once the question of input has been resolved, I would then proceed to again define my 7 EVs using the uploaded input and set up contrasts where I check for interactions between the EVs
>
> 4) A 3rd higher level analysis using the output of the former, where now only the between subject factor is tested
>
> I hope I was able to explain my design and question in a semi-understandable way. Any help and suggestions are greatly appreciated!
>
> Many thanks in advance and kind regards,
> Laura
>
>
> --
> Laura Mega, stud. Dipl. Biology
>
> Werner Reichardt
> Centre for Integrative Neuroscience (CIN)
> Paul-Ehrlich-Straße 17
> 72076 Tübingen
>
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