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Dear Lars, If you included all the conditions in the inversion you should get one file per condition per subject (two files if you count both w.. and sw...). Are you sure SPM didn't crash for some reason after writing out one file or that you waited long enough? Sometimes writing out nifti files is quite slow and it looks like Matlab is idle during this process. Also SPM would write nifti files out in the directories of the original datasets. Maybe you just haven't found them? If none of this is true, just put a breakpoint at line 225 of spm_eeg_inv_group where there is a loop over subjects and see what's happening. Best, Vladimir On Tue, Jan 26, 2010 at 1:46 PM, Lars Meyer <[log in to unmask]> wrote: > dear all, > > during group inversion of eeg data (one .mat-file including four conditions per subject, 21 subjects), only a single nifti-file is written, for the first subject, as it appears. how can i specify which nifti-files are written (i.e. make the group inversion write a single nifti-file for each subject)? is there an option i haven't found in the group inversion workflow? or did i simply misunderstand the group inversion process? > > > many thanks in advance, > lars > > > > > Lars Meyer | MSc > Max Planck Institute for Human Cognitive & Brain Sciences > Department of Neuropsychology > Stephanstraße 1a > 04103 Leipzig | Germany > > Office | +49 (0)341 99 40 22 66 > Fax | +49 (0)341 99 40 22 60 > Mobile | +49 (0)175 113 76 65 > Home | +49 (0)341 974 26 49 > Mail | [log in to unmask] > Web | www.cbs.mpg.de/~lmeyer >