If you are doing an ROI analysis, then your group analysis will need
to be done outside of SPM as you will have extracted the values from
your ROI.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Thu, Jul 24, 2014 at 10:34 PM, Andy Yeung <[log in to unmask]> wrote:
> Dear all,
>
> I'm planning for a future project.
>
> To define functional ROI, is it okay if I do it by letting subjects
> experience a shorter session right before real sessions?
>
> If my hypothesis is certain area will activate, eg insula, is it okay if I
> pick up the peak voxel coordinates from insula from the subject and make 5mm
> spheres as my functional ROI (even if they don't survive after FWE
> correction)?
>
> If the above is fine, then in group analysis, how should I proceed when I
> try to press the 'ROI analysis?' button in the 'Results'? (Coz everyone has
> difference functional ROIs).
>
> Thanks a lot.
>
> Best,
> Andy
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