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Hi Noelia, I would avoid the Glacher and Gitelman tutorial as it contains some poor advice for specifying these types of model correctly. The preprint here may be more useful for you in understanding both the models that you need as well as the contrasts: https://psyarxiv.com/a5469 Best wishes Martyn ------------------------------------------------- Martyn McFarquhar, PhD Lecturer in Neuroimaging G30 Zochonis Building The University of Manchester Brunswick Street Manchester M13 9GB +44 (0)161 306 0450 -------------------------------------------------