Thanks Francois,
Hoping not to be OT with this question:
In the tutorial above I see we use the Faces - Scrambled difference. That’s pretty clear and I can totally follow it to analyze my Seen - Unseen and my Valid - Invalid main effects.
However I am not sure how to proceed in a 2 x 2 factorial design when I would like to compute an interaction term such as (A2B2 - A1B2) - (A2B1 - A1B1).
Should I compute all these differences right at the beginning fo the workflow, i.e., estimate the Difference A-B of Seen Valid - Seen Invalid, the Unseen Valid - Unseen Invalid, and then the Difference A-B of these two files per each subject?
Thanks!