Hi Michal,


The results will depend on the seed you used to calculate RSFC in the first place. What kind of seed did you use? How do the individual RSFC_Z maps look? Can you see a pattern there? You have to expect a similar pattern emerging in the group analysis.

The fact that you have nan P-values most likely has to do with a discrepancy between your mask and the data that go into the analysis. Carefully check that the analysis really includes only voxels that are present in all subjects. If I remember correctly you get this error if your mask is bigger than your actual data. (what we often do to mask is fslmaths 4dimage.nii.gz -abs -Tmin -bin outputmask.nii.gz)

The RSFC_Z maps are not zvalues, they are Fisher-Z transformed (a transformation to improve normality for correlation values).

Maarten