Has anyone successfully used motion in a model as a covariate of
non-interest? I've managed this with other software packages (VoxBo)
but I am getting strange results with FSL. Adding motion as a
covariate of non-interest didn't change the results at all, while there
is a huge motion-related spike in the timeseries. Basically what I did
was load the prefiltered_func_data_mcf_abs file as a 1-column vector,
not convolved, and orthogonalized w.r.t. all covariates of interest.
If you've got this to work, did you :
A) Use the absolute motion, or put in a covariate for each of the
directions of motion?
B) Did you renormalize the motion param eters at all before feeding
them into FSL (for example demeaning them)?
Thanks,
Vikas
****
Vikas Rao
Lab Assistant
[log in to unmask]
Clinical Neuroscience Lab, UCLA
www.cannonlab.net
310-794-9673
|