Hi Freesurfers!

 

I would like to compare the effect of different nuisance regressors (I.e., cardiac and respiratory signal, motion) on my resting-state data. For that I’m adding the respective regressors to my first-level GLM. Now, how can I best compute a contrast between the effect of different physiological regressors and motion? Would I add them as task regressors in 1st level or rather as nuisance regressors and how can I get second-level comparison of their effect?

 

Thanks in advance for your help!

 

Best,

Maria