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Dear SPM users, I use SPM for analysing a MRI working memory task in subjects with AD and I am wondering, if someone can help with choosing a cut-off period for this task / box-car design with three different conditions. Each condition takes 30 sec, TR of 3 sec, task-duration 10 minutes. The design: Rest (a) zero back condition (b) for 5 minutes; Rest (a) one back condition (c) for 5 minutes) a b a b a b a b a b a c a c a c a c a c Or does anyone have an even better idea for analysing this set of data? For example to split it into two separate sessions? Thanks a lot in advance, Martina