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Create a new condition. On 11/26/2013 06:37 PM, Angela J wrote: > Dear SPMers, > > What's the best option to add a nuisance regressor to the design matrix consisting of some error trials? The two options I'm undecised about are 1) creating a new condition (in the Data&Design item) and give SPM the onsets of those error trials or 2) add a regressor (in the Regressors item). The problem with option 2 is that I cannot add onsets, so how would SPM know at what point in time that error trial occurred? > > Thank you in advance, > > Angela > >