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Hello SPMers! I’ve got a very basic doubt, but really fuzzy for me. I' m performing a full factorial design second level, I ve got 3 factors with two level each, so there are 8 cells in my design matrix, 16 scans in each cell. I'd like to add as a covariate the level of familiarity for the items of my 16 subjects, and I wonder how the vector I have to write in the "covariates" form should be, as I have 16 values, one for each of my subject. Is it impossible at all? F. -- Federico Nemmi Dipartimento di Psicologia, Università La Sapienza, Roma