Dear Donald,
Thank you for your prompt reply. I am working on EEG-fMRI integration and I would like to add a parametric modulation with a specific ERP amplitude. I know run concatenation is not a trivial matter because of AR(1) term, high-pass filter and linear trends, but I found the function
spm_fmri_concatenate that suits me well, I think. Furthermore I have about 10 s from the beginning of a session and the beginning of the first block of that session and from the end of the last block in a session and the end of that session, so if I concatenate the sessions, I will not have HRF going across runs block. What do you think?
Thank you for your attention to this matter.
Best regards.
Ilaria
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