Dear all,
I have found a bash script by John Ashburner on the University of Warwick's website (https://www2.warwick.ac.uk/fac/sci/statistics/staff/academic-research/nichols/scripts/spm/), called mp_diffpow24, which can be used to create additional regressors for first level fMRI analysis from the usual six motion regressors. Specifically, it gives out the squares, temporal derivatives and squares of the temporal derivatives of the six motion regressors.
I am curious whether
a) anyone has made any experience with using this (or a comparable) script, in terms of enhancing first level fMRI analysis (or if there are any systematic studies on the benefits/drawbacks of including such regressors in the first level analysis),
b) whether there are any specific applications (MRI sequences, designs, etc) in which such a script might be recommendable to use,
and c) whether there are any circumstances under which it is best not to use such additional regressors.
I am not aware of any fMRI studies in which this script has been used, and I'd be happy if anyone know of some good example.
Thanks in advance,
David
|