I was wondering about the influence of the keyword
parameter_source in SpecifyModel on the model fit.
The documentation says:
parameter_source: (‘SPM’ or ‘FSL’ or ‘AFNI’ or ‘FSFAST’ or ‘NIPY’,
nipype default value: SPM)
Source of motion parameters
The default value is
SPM, so it seems obvious that if motion correction has been done with fsl’s mcflirt, you would want to change it to FSL. However, in the
fsl example workflow, the model is specified with
SPM as parameter source, even though motion correction was done with mcflirt. So, does it matter at all what you choose there?
The reasoning I am asking, is that for a couple of all the runs in my dataset, fitting the autoregressive model during
film_gls crashes due to a singular design matrix, and I can’t find an obvious reasons for that. So, perhaps the parameter_source might play a part in that?