Dear SPMers,
I included movement parameters in the design and this comes with brain
activations. As my data seemes to be clean, i.e motion parameters
generated after realign indicated that maximum motion is below one
voxel size (0.4 mm),I tried not to include movement parameters, but
unfortunately the model estimation (SPM.mat) failed and I've got the
following error :
Failed 'Model estimation'
Error using ==> spm_spm at 840
Please check your data: There are no significant voxels.
In file "G:\LOGICIELS\SPMs\spm8b\spm_spm.m" (v1237), function
"spm_spm" at line 840.
In file "G:\LOGICIELS\SPMs\spm8b\config\spm_run_fmri_est.m" (v2403),
function "spm_run_fmri_est" at line 69.
The following modules did not run:
Model estimation
Any help is very appreciated.
I have another question according to the last posts about including
movement parametrs as regressors in a 1st design (espacially the last
post from Marko Wilke,
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1009&L=SPM&P=R21658&1=SPM&9=A&J=on&d=No+Match%3BMatch%3BMatches&z=4).
It seems that "Including them is not always helpful" espacially when
we have a "clean dataset". It's ok to me. Now, my understanding of
including movement parameters is to use them as regressors of non
interest. Is it right? if it is, why do we have to include them if the
images are correctly realigned (i.e resliced) even when motion exceeds
the voxel size?
Any comment on this would be thankful.
Salem
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