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Dear SPM users, I ran a group DCM estimation using the PEB-BMR option which would result in a GCM.mat file that has DCM structure of all subjects in it. I use spm12 (v6906) on Matlab 2016a on a HPC. In the spm_defaults.m file, I have already changed the default mat file format. defaults.mat.format = '-v7.3'; However, in this estimation, the following massage appeared, and the GCM.mat was not saved after 6 days of estimation. [Warning: Variable 'GCM' cannot be saved to a MAT-file whose version is older than 7.3. To save this variable, use the -v7.3 switch. Skipping...] Would you be so kind to point to me where the code assigning the format of GCM.mat file is, and why the GCM.mat file was not saved using the -v7.3 set in the spm default file? I am also wondering if there is a possibility to parallelize the group DCM estimation process. Currently it is done subject by subject sequentially for the full model. I think it should be possible to run estimation for the full model of all subjects in parallel, taking advantage of the HPC, but I'm not so sure where the code of the loop to run estimation over subjects/models are . Thank you very much. Best regards, Chun-Ting Hsu Postdoctoral Scholar Brain, Language, and Computation Lab Department of Psychology Pennsylvania State University