nuisance
(Optional) A \(T \times N_{nuis}\) matrix of nuisance signals, where \(T\) is the number of timepoints and \(N\) is the number of nuisance signals, or a list of these for multi-session analysis. Nuisance signals are regressed from the fMRI data and design matrix prior to GLM computation. Nuisance signals can include motion regressors, HRF derivatives not being modeled as tasks, and other sources of noise.
Detrending/high-pass filtering is accomplished by adding DCT bases to the
nuisance matrix; see the parameters hpf
and DCT
.
Do not add spike regressors for scrubbing to the nuisance
matrix.
Rather, provide these in scrub
so that their corresponding timepoints
are also removed from the BOLD data after nuisance regression.