Dear Dr. Ashburner:
It was high pass temporal filtering I was referring to.
Thanks alot
Jeff
On Mon, 23 Apr 2001, John Ashburner wrote:
> > Considering your comments, is there a problem with performing
> > high pass filtering prior to spatial normalization as our group has
> > recently been doing with several datasets?
>
> I'm not sure about this one. Is this spatial or temporal high-pass
> filtering.? If it is temporal, then it should make little difference if it is
> performed before or after the warping, although tt would be better to include
> the high pass filtering as part of the SPM statistical processing (to account
> properly for degrees of freedom etc). If it is spatial, then I'm not sure
> why it is being done.
>
> Best regards,
> -John
>
> --
> Dr John Ashburner.
> Wellcome Department of Cognitive Neurology.
> 12 Queen Square, London WC1N 3BG, UK.
> tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381
> fax: +44 (0)20 78131420
> http://www.fil.ion.ucl.ac.uk/~john
> mail: [log in to unmask]
>
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