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If you want to put in regressors which are not convolved, you can enter them as (multiple regressors) instead of conditions. It should be fine to have no conditions if you don't want them. Volkmar On Fri, 11 May 2007, Richard Masterton wrote: > The SPM.mat file is a matlab data file. If you are in the directory that > contains the SPM.mat then you can read it from within matlab by typing: > > load SPM > > This will load the SPM data structure into your matlab workspace into the > variable SPM. > > The format of the SPM data structure is documented in the SPM code. The > parts that relate to the design matrix etc are described in spm_fMRI_design.m > (type "help spm_fMRI_design.m" for details). > > After you have made the changes you want you can then save it back to file > using: > > save SPM SPM > > Hope this helps, > > Rich. > > Terrance M Darcey wrote: >> Is the format of the SPM.mat file readily available?...I assume one can >> figure it out from the matlab code, but I would like to avoid that...In >> particular, I would like to be able to extract/view/replace design vectors >> for task conditions without having them already convolved with the HRF... >> >> Thanks! >> >> TD >> >> > > > -- Volkmar Glauche - Department of Neurology [log in to unmask] Universitaetsklinikum Freiburg Phone 49(0)761-270-5331 Breisacher Str. 64 Fax 49(0)761-270-5416 79106 Freiburg http://fbi.uniklinik-freiburg.de/