Hi - we actually implemented the spatial smoothness estimation stuff from
scratch - for full details see Mark Jenkinson's techrep on this on the
analysis group techrep (sorry, I can't get to a web browser right now to
get the URL).
Cheers.
On Wed, 10 Nov 2004, Katie Karlsgodt wrote:
> Hi,
> thank you very much, that does answer most of my question. The only other
> thing is, if the corrected p-values are essentially the same for both
> articles, is one or the other method used to generate the p-values used by
> the program? (is one used to get the p-value as a default, or if they are
> both used, if they differ is the more conservative one used?). I am trying
> to respond to a question about which one of these 2 articles the p-value
> determination came from, which is why I'm wondering about this so
> specifically.
>
> thanks,
> Katie
>
> On 11/9/04 11:55 PM, "Joseph Devlin" <[log in to unmask]> wrote:
>
> > Dear Katie,
> >
> > Forman and Friston independently proposed using spatial extent as a method
> > for correcting for the multiple comparison problem which is why both
> > references are listed in the report.html page. The methods give
> > essentially the same corrected p-values (the P column in the Feat report).
> >
> > Hope that answers your question.
> > All the best,
> >
> > Joe
> >
> > --------------------
> > Joseph T. Devlin, Ph. D.
> > FMRIB Centre, Dept. of Clinical Neurology
> > University of Oxford
> > John Radcliffe Hospital
> > Headley Way, Headington
> > Oxford OX3 9DU
> > Phone: 01865 222 494
> > Email: [log in to unmask]
> >
>
> ___________________________________
> Katie Karlsgodt
> Dept of Psychology/Cognitive Neuroscience
> University of California, Los Angeles
>
> [log in to unmask]
> (310) 794-9673
>
Stephen M. Smith DPhil
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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