The "window" size is determined by the first level model.
You should use the flexible factorial model and include a subject
factor. The dependence should be yes and the variance equal.
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 12, 2012 at 8:26 AM, Wouter De Baene
<[log in to unmask]> wrote:
> Hi all,
>
> To get a more dynamic view on the brain areas involved, I want to model the data by using FIR instead of HRF.
> I'm not entirely sure that when I put subsequent windows (e.g. window 1 = 0 to 2s; window 2 = 2 to 4s; ...) in a full factorial model, these windows should be treated as independent or not and their variance as being unequal.
>
> Could somebody confirm/deny this?
>
> Best regards,
> Wouter De Baene
>
>
> __________________________________
>
> Wouter De Baene, PhD
> Ghent University
> Research Foundation Flanders (FWO)
> Department of Experimental Psychology
> Henri Dunantlaan 2, 9000 Ghent, Belgium
> tel +32 9 264 64 04
> http://users.ugent.be/~wdbaene/
> __________________________________
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