Thanks for the prompt reply.
Does this have something to do with over modeling/fitting the data?
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?
Irene
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