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Dear Ling, what you observe is very likely due to a bug present in older versions of SPM5 (in @nifti/private/write_hdr_raw.m to be precise), see: http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind0802&L=SPM&P=R26272 This is now fixed in the current set of updates: ftp://ftp.fil.ion.ucl.ac.uk/spm/spm5_updates/ so I strongly suggest that you update your SPM5 version. Also, note that this error appears because there are directories in your MATLAB path that contain images with the same filename than the images that should be created in your current analysis. It is good practice to restrict one's MATLAB path to the minimal set of directories (do not use "Add with Subfolders") and, for example, not including directories containing data or SPM analyses. I hope this helps. Best wishes, Guillaume. Wang, Ling wrote: > Dear All, > > I met a sort of strange situation. I did not get .hdr files but only > .img files for some of my subjects after statistical analysis. I used > the same script for statistical analysis, but for some subjects I can > get regularly .hdr and .img files. I searched the spm mailing list but > did not find the similar problems. It would be highly appreciated if > someone could give me some hints! Thank you in advance! > > Our working environment is: SPM5 (spm_spm.m version 649), Matlab7.3.0 > (R2006b), Linux. > > Best wishes, > Ling -- Guillaume Flandin, PhD Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square London WC1N 3BG