Willfried:

What you describe has nothing to do with PPI. It appears you are
trying to set up a second level model and somehow the images are not
where SPM thinks they should be. You need to check your image paths
and permissions. You can check these when you set up the model in the
batch editor to make sure you have selected them properly. If the
models have already been set up and the SPM.mat file has been saved,
you can load SPM.mat in Matlab. Then look at the field SPM.xY.VY for
the filename locations saved in SPM. Make sure you can read the files
at those locations. For example you could try opening them using Check
Reg or Display.

Hope this helps,
Darren

On Tue, Feb 21, 2012 at 7:35 AM, Scharmueller, Wilfried
([log in to unmask])
<[log in to unmask]> wrote:
> Dear Prof. Dr. Gitelman,
>
>
>
> I´m research assistant at the University of Graz. For now I try to make some
> fMRT Connectivity Analyses. For this I use your Instructions in the SPM8
> Manual about Psychophysiological Interactions.
>
>
>
> I now write you because we are struggling with the PPI-Group Analysis.
>
> We followed your Example about the PPI in the SPM8 Manual chapter 16.
>
> Everything is working fine like in your Example. We have PPI´s for every
> subject and can explore it in SPM.
>
>
>
> Now we are at the point that we want to  make a Group Contrast between 2
> Groups.
>
> When we try to set up a second level two-sample t-test, SPM cannot run the
> “model estimation”. It says: Error using è spm_sample_vol       Can’t get
> filename.
>
>
>
> The Problem is, that we cannot display the images from our analysis (*.con,
> *.beta, *.spmT, …). The Error-Message is “ images can not be resampled”. It
> is possible to display the *.con images in MRIcroN.
>
>
>
> Do you have any idea what was going wrong? Maybe you can help us to solve
> this Problem!
>
>
>
> Is there a “How-To” for Group – PPI Analysis?
>
>
>
> It would be very nice if you can give us some tip´s!
>
>
>
> Yours sincerely,
>
> Wilfried Scharmüller
>
>
>
>
>
> Mag. rer. nat. Wilfried Scharmüller
>
> Department of Clinical and Health Psychology
>
> Institute of Psychology Universitätsplatz 2/III University of Graz
>
> A-8010 Graz
>
> Austria
>
> Phone: +43 (0)316 380 8519
>
> Fax:       +43 (0)316 380 9808



--
Darren Gitelman, MD
Northwestern University
710 N. Lake Shore Dr.
Abbott 11th Floor
Chicago, IL 60611
Ph: (312) 908-8614
Fax: (312) 908-5073