Hi Sasha,
it depends on how many subjects you have in your study (more subjects,
less smoothing required), and how anatomically localized you believe your
effects should be (more localized less smoothing). Note that in general you
don't pay nearly as steep a price for extremely large smoothing kernels on
the surface as you do in the volume, since the surface-based kernel never
extends into bone/air/white matter etc. We've used a wide range of values,
anwhere from 5 to 30mm fwhm.
cheers,
Bruce
On Thu, 25 May 2006,
Sasha Wolosin wrote:
Dear all,
In group analysis, how should I determine which value to use for the
Gaussian fwhm smoothing kernel? Is there a recommended number?
Thanks,
Sasha
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