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On Fri, Jun 28, 2013 at 1:37 PM, Irene Giannoylis < [log in to unmask]> wrote: > Thanks for the prompt reply. > > Does this have something to do with over modeling/fitting the data? > >> Yes. You need some points that represent baseline to get a good estimate of the constant term in the model. > > Also, to model noise I am using 'conn' to extract PCA components of WM and > CSF signal which I regress as covariates of no 'interest' in spm. To do > this, task information is entered in 'conn' at setup so that it is not > included in the estimation of the PCA components. Do we include the rest > information here? > >> I've never used the toolbox for task data. Usually, WM and CSF regressors are not included as covariates in task analysis. > > Irene > >