It takes the motion correction parameters (number of time points by 6),
performs an SVD (this is what is stored in mcextreg file). It will then
use the top 3. I don't know of any guidance as to whether to use them or
not. I've seen it help, I've seen it hurt. Sorry I can give you more.
doug
Ga
Hi,
I noticed that mc-sess produces a file for external mc regressors that can
be used for analysis with "mcparams2extreg". I can see the added regressors
in my design matrix if I decide to include them. How are these external
regressors actually calculated? Are the same set of motion parameter
