Dear Freesurfers

Hi

I am using white matter and CSF  external nuisance regressors in my mkanalysis-sess.

However, when I make these regressors, I use -mean in fcseed-config command, and so the .dat files only have one column (the mean values, I assume).

I looked up in the freesurfer archive and I saw that It is recommended to use  -nuisreg wm.dat 5   and -nuisreg vcsf.dat 5.

My question is that what difference it makes to use mean of these regressors vs using only 5 of the columns.

I appreciate if you could please reply whenever you had time.

Thanks

Mona