They will be automatically mean-corrected when building the design
matrix (which contains a constant term anyway):
On 08/02/2019 14:48, Carole Guedj wrote:
> Dear SPM user's
> I would like to enter the average signal CSF and WM signal (as non-interest regressors) into my 1st level analysis, and along with movement estimates.
> I was wondering if these signals should be detrend prior to be fed into the model, or if SPM automatically takes care of it when estimating the model.
> Many thanks in advance for any help,
Guillaume Flandin, PhD
Wellcome Centre for Human Neuroimaging
UCL Queen Square Institute of Neurology
London WC1N 3BG