Hi Gregor,
For each time point you want exclude, create an additional regressor that is all zeros except for the timepoint, that row should have a value of 1.
So if you want exclude 5 timepoints, you will need 5 additional regressors.
Best,
Donald
> On Feb 10, 2018, at 4:02 AM, Gregor Kondla <[log in to unmask]> wrote:
>
> Hello everyone,
>
> First of all, thanks to anyone contributing to the mailing list, it is a fantastic resource!
>
> My challenge is that I would like to exclude volumes from my first level analysis in SPM. One option would be to not include the volumes in the specification in the first place. However, that would mean that I need to adjust my design matrix. That gets messy really quick...
>
> Is there an easier way in SPM to exclude time period from analysis (like time_exclude in freesurfer)?
>
> Thank you in advance and keep up the good work. Kind regards,
> Greg
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