Hi Rajeev and Patricia,

I believe it is not a bug in Conn as such but got to do with SPM; when you preprocess the data in SPM, the resulting nifti files do not have the TR value anymore (i.e. TR is set to be zero). 

I tried loading one of my raw fMRI image volumes

image = spm_vol('rsfMRI.nii,1');

on exploring the "private" nifti object inside the image structure, I found a field called "timing" [image.private.timing] which returns two sub-fields: toffset, and  tspace
where tspace contains the original TR of the images. If I open any of the SPM processed files, I do not see any timing field!

Also, it is quite interesting to note that both of you suggest that the TR = 1 for your processed files; however, in my case I see TR = 0. I am using SPM 12b and checking the image information using MRICron, on a Windows machine.

However, the information must be existing somewhere in the header and/or can be reconstructed because the SPM.mat file (after first level specification) contains the TR value in the SPM.xY.RT field.


Best
Pravesh

Originally posted by Patricia M: