Hi Aga, that does sound strange. mri_concat does no processing at all, so if that subject looks ok before you run mri_concat, it should look fine afterwards. Try running just that subject through mri_concat (so there's no real concatenation). Also, make sure that the bad subject in the mri_concat output is the same subject that you are looking at individually; you could be off by 1.
doug
Agnieszka Burzynska wrote:
Dear experts, I used mri_concat to concatenate sig.mgh files from fixed-level analysis (combining runs within each subject). All input files when viewed as initial single frame images look correct. For one person, however, in the multiframe image the sig.mgh looks just like noise (see attached picture). I used only --i and --o in the mri_concat command line. What could have happened? I get no error messages and everything else looks ok.
Thank you for your help, Aga
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