First: thanks for the quick reply. After setting up the contrast with: To setup this contrast: P.Contrasts(1).left={'E_re'} P.Contrasts(2).right={'E_nre'} I keep getting the following error message: RROR 1: P.Contrasts(1).right is not formatted correctly. ERROR 2: P.Contrasts(2).left is not formatted correctly. One or more inputs are not correct. ERROR 1:P.Contrasts(1).right is not formatted correctly. ERROR 2:P.Contrasts(2).left is not formatted correctly. errorvals saved to errorvals.mat Other setting in my template are: P.Contrasts(1).MinEvents=1 P.Contrasts(1).STAT='T' P.Contrasts(2).MinEvents=1 P.Contrasts(2).STAT='T' Because only P.Contrasts(1).left & P.Contrasts(2).right have been defined: do I have to set Contrasts(1).left='none' & Contrasts(2).right='none'? Find the errvals & my template attached to the post. Thanks in advance & best regards ben