Hi John
With the caveat that I've limited experience, I think it is best to keep all the volumes cf
power. One way around the SOTs problem is to manually specify the regressor. That
way you can specify how ever many or few SOTs as you want, convolve them with the
canonical HRF (spm_hrf), and sample this time course at the time of ALL scans. You
would of course need to create a separate regressor for and model all effects you would
be expecting to influence blood flow - i.e., one regressor for 'accurate' scans, another for
'inaccurate' scans.
Cheers
Christopher
On 30/8/08 6:17 AM, "<John> <Gelburg>" <[log in to unmask]> wrote:
> Hi,
>
> I am creating my ER design with optseq. Suppose some volumes I don’t want to
> include in my analysis (for example, incorrect subject’ behavioral
> response). Is it possible just to remove the volume and numbers of
> consecutive events will be shifted? I would assume this to be problematic
> from ER deconvolution point of view. Then, is it’s possible, what is the
> correct way to do this.
>
> Thanks!
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