There's no real good answer to this, either in the volume or the surface. We usually go from 5-20mm. Some considerations are:
1. Make fwhm = size of your activation. 2. More smoothing can sometimes compensate for misregistration 3. Smoothing does affect multiple comparisons.
doug
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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