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Hello Marco, If you have one event that ALWAYS closely follows another, with no jittering and no randomization, then there is going to be considerable correlation between the two, and you won't be able to estimate either well. You need variability of some sort to be able to reliably separate the two EVs. cheers, -MH On Mon, 2011-10-31 at 21:36 +0000, Marco Loggia wrote: > Dear FSL team, > > An EV in my design has events which occur immediately prior to the events of a different EV (i.e., each occurrence of the EV "stimulus" always begins at the end of the an event of the "expect stimulus" EV). When I model the two EVs, I would like to make sure that no signal from each EV was 'picked up' by the the other one, and for this reason I was thinking to avoid the use of temporal derivatives. > > I was wondering if you could share some thoughts on this strategy. Thanks! > > Marco