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Dear Alexandre, If your covariates are correlated, you could orthogonalise the second with respect to the first. You can then test each of the covariates or both if this makes sense conceptually. I hope this helps Martin > On 17 Jul 2015, at 13:18, SUBSCRIBE SPM Anonymous <[log in to unmask]> wrote: > > Dear all, > > I would like to perform a correlation analysis from a one-sample t-test that contains cond1>cond2 con*.img files. > My question concerns the covariates I have to enter : they are correlated, is there any way to control this in the one-sample t-test design ? > Following this, is it possible to see the activations associated to the covariate 1, covariate 2 and both of the covariates in the one-sample design ? > > Regards, > > Alexandre Obert