Thank you for the suggestion! I looked at the images and it seems that the error is introduced during the slice timing step. One or several images are concatenated. When I remove the problematic images from first level specification, I get the following error message:
"Failed 'fMRI model specification'
Error using spm_run_fmri_spec (line 273)
Length of regressor is not commensurate with data points."
Any idea how to
1) fix the slice timing step so that no concatenated images are produced
or
2) fix the length of regressor error so that I can remove the problematic images from the first-level specification step?
Thank you all very much for your help!
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