Dear Kevin,
this is the intended behaviour for regressors, because they can't be
assumed to be nuisance in general. The only bug is that the job
configuration does not allow to set nuisance covariates at all.
Volkmar
Am Mittwoch, den 27.02.2008, 14:56 -0800 schrieb Kevin Hill:
> Hello, we seem to be experiencing a minor problem with spm_jobman with
> all versions of spm5.
>
> the 'jobs' struct has two fields:
> jobs{1}.stats{1}.fmri_spec.sess.multi and
> jobs{1}.stats{1}.fmri_spec.sess.multi_reg which I believe are supposed
> to hold location of files which contain the covariates of interest and
> nuisance regressors respectively. However the resulting SPM structure
> has all of the regressors specified by the files indicated in both
> fields as covariates of interest in SPM.xX.iC, and no regressors are
> listed in SPM.xX.iG, as I think they should be. So I have two questions:
>
> 1) Am I specifying the nuisance regressors incorrectly? If so, what is
> the proper way to specify them?
>
> 2) My understanding is that the non-sphericity of the noise is computed
> only in the voxels which pass a F-test for the covariates of interest,
> so would this bug/error result in a small mischaracterization of the noise?
>
> -Kevin Hill
>
--
Volkmar Glauche
Freiburg Brain Imaging
http://fbi.uniklinik-freiburg.de/
Phone +49(0)761 270-5331
Fax +49(0)761 270-5416
|