Hi Oliver,
There should be many volumes in the Buck.PRF dataset. Note that buck.nii.gz is not technically valid NIFTI because it has many different stat types, so it is possible you would want to break it apart for other software.
In any case, that dataset has many volumes, one for each parameter, plus statistics. It might be good to watch a video on viewing statistical results, such as:
[
www.youtube.com]
Also, maybe review the help for that PRF model function, which is not obvious how to see:
3dNLfim -DAFNI_MODEL_HELP_CONV_PRF=Y -signal Conv_PRF
Maybe the output volumes are not so well described, but note that the purpose of the program is to find model parameters at every voxel, plus statistics for significance.
Would you like more details on the output? Running "3dinfo -VERB" on the output dataset might be helpful, too.
- rick