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Dear SPM experts, Hi. I have some questions about 1st level model specification--because of the way too complicated experimental design, I'm stucked in following problems. I did an event-related experiment, having 2 conditions which were replicated in 5 sessions per a subject, and.. 1. Is it possible that the 2 different conditions contain the same stimuli presentation times (not all of them are the same between two conditions, but some of them)? In other words, is it okay if I put the same onset time in both conditions? Actually I tried it, and the spm8 program did make a SPM.mat file, but I can't sure this is right. 2. Is is okay if I put the same stimulus onset time 'twice' in one condition? Well I want to weight certain trials in one condition but I couldn't find a way. 3. Is it possible that some sessions contain both 2 conditions, and the other sessions contain only one condition? I tried to find the answers but after lots of trials and errors, it seemded to be better to ask some advice of you experts. Thank you very much in advance. BK.