If you are familiar with batching (in Graphics window under TASKS) you can set up a Contrast Manager job, then replicate that job 19 times; you would still need to select each individualıs SPM.mat file 20 times. Iım sure there are probably many people who have already created batch code which can be called using a text file with file paths, for example; have you searched the list? Good Luck -Julie On 7/16/09 4:57 PM, "Hubert,Marco" <[log in to unmask]> wrote: > > > Dear all, > > is there any possibility to define contrasts (in spm5/matlab) for all > particpants in one step? I.e. A vs B (1 -1) for 20 participants, without > doing that twenty times? > > Thank you!! > > Marco > >