Hello Emily,

I will confess to no specific experience with Marbar. However, for second level analysis, oyu still need the files from the first level analysis, which are the inputs for the statistics.

You can change the file paths by loading the SPM.mat file into matlab (with the folder with the analysis as you current directory, type: load SPM). Then you can change the variable names inside the SPM file as you would any other matlab variable.

So, SPM.xY.P = 'newfilepath/name'

Check if the path names are cells (don't have spm right now to check), and if so, enclose the string in { } .

If your boss only gave you the images from the 2nd level analysis, and not the con and beta files from each participant, than they did not give you enough info, I believe. There is a big limit on what you can achive without the subject info.

I hope that was helpful. Welcome to the exciting world of fMRI and SPM, and good luck!

Colin

On 22 December 2013 03:49, Emily Carlson <[log in to unmask]> wrote:

Hello,

I've been trying to solve this situation for a while unsuccessfully. I'm working with SPM for the first time as a Master's student. My supervisor, who works at another University from my own, would like me to complete ROI analysis in SPM/MarsBaR, and has sent me SPM.mat files, beta and con image files, etc., containing a full factorial analysis from a 3x2 design.

SPM.xY.P of course contains file paths to con images for computers at the other university; how can I change these? Also, the paths in these variables reflect single subject analysis, where as I should be doing 2nd level analysis.

I hope this question makes sense, I'm obviously quite new at this. I very much appreciate any help!
Thank you,
> Emily

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