Hello SPMers!
In our individual model, we have an unmodulated regressor and 4 parametric modulators (defining different conditions), each one is of interest.
As suggested by the (excellent) paper of Mumford et al : ' Orthogonalization of Regressors in fMRI Models' I wanted to circumvent the automated orthogonalization procedure and create modulated regressors outside of the GUI and enter them as user-specific regressors in the SPM analysis.
in the paper they said " If using SPM12, there is now an option to orthogonalize within the graphical user interface"
I don't find it. Should I use spm_orth ? how ?
Thank you for help !
Isabelle
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