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Dear Karin, In principle this is not a problem. Basically, the same rules apply for DCM as for a standard mass univariate GLM analysis: if you have enough trials to reliably find a difference using the GLM, then DCM will also be able to deal with this. Just as you generally wouldn't run a GLM modelling only 1 event (or block) the same holds for DCM. Hanneke On Tue, Apr 10, 2012 at 8:46 AM, Karin Lundengård <[log in to unmask]>wrote: > Dear SPM:ers, > I am going to use dcm on data from an experiment where the test persons > are allowed to look at an image shown during several different time spans. > My question now relates to the fact that we have a higher number of > instances when the image is shown during a short time than during a long > time, so now I am wondering if this is a problem? Should I have an equal > number of time points for each category och stimuli? > Yours, > Karin > -- Hanneke den Ouden, PhD Center for Neural Science New York University 4 Washington Place, room 873 New York NY 10003