Hi - yes, it is a true centre of gravity using the Z values as weighting.
Cheers.
On Fri, 1 Oct 2004, Ville Ojanen wrote:
> Hi,
>
> How are the center of gravity values for activated clusters calculated?
> Namely, are all voxels above the significance threshold uniformly weighted or
> weighted by their z-value or some other way?
>
> Many thanks,
>
> Ville Ojanen
>
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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