Hello, I am reposting my problem because I did not hear from anyone and I am really tock, please someone help me , if you can!!! I have a problem determining the high pass filter for my data. I would greatly appretiate it if anyone could help me. My paradigms are as the following: enventrelated fMRI ISI: 4325ms - 8375 4 types of stimuli in each run the biggest interval between 2 stimuli of the same type: 305s does it mean that I should ave a highfilter with the cut-off period of 610s? if not, what wold be the best? many thanks in advance, Ladan Ladan Ghazisaidi Étudiante au Doctorat en Sciences Biomédicales Université de Montréal, Centre de recherche Institut universitaire de gériatrie de Montréal 4545 Ch. Queen Mary Montréal, Québec H3W 1W5 tél. 514 340-3540 poste 4700 e-mail: [log in to unmask]