Hi Rick,

thanks for the clear answer - I will have a closer look at example 11 then. Is saving degrees of freedom the only reason for not using bandpassing here or are there other problems when adding it to example 11? Does it cost many DoF to regress the first 3 principal components as compared to just regressing mean CSF signal?

When you say one would rather censor more: do you mean that the thresholds I chose (motion limit = .3 and outlier limit .3) might not be stringend enough? I received the advice from a collaboration partner to not include subjects who lose more than 50 out of 200 volumes, therefore I chose slightly more liberal thresholds to retain more subjects. I have a twin design, therefore excluding one subject means actually excluding his twin as well...

Unfortunately I do not have physiological signals.

Many thanks for your advice!
Janina