Dear FSL users, I would appreciate some advice on this: I am interested in doing
correlation analysis on time series data extracted w/ fslmeants of various anatomical
ROIs from FEAT preprocessed fMRI data. I have a set of nuisance time series (CSF, WM
and whole brain global drifts). What would be the correct way of regressing these
nuisance covariates out of my time series? I can think of two ways but am not sure which
(if any) is correct, nor how to implement them:
1. orthogonalize the ROI time series with respect to global drift time series. Is the FSL
orthogonalization available as a separate command line program?
2. use GLM to figure out PEs for nuisance regressors and subtract from signal. Not sure
how to go about doing this.
Tal Herbsman, MD
Department of Psychiatry
University of Wisconsin School of Medicine and Public Health
6001 Research Park Blvd.
Madison, WI 53719-1176
Office: (608) 263-6100
Fax: (608) 263-0265
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