Dear Freesurfer users,
I would like to know what is the level of smooth recommanded to use for surface-based group analysis? Thank you, All the best, Charlotte
There's not one level of smoothing that will fit all situations. I usually use 5mm-15mm. doug
On 04/17/2012 09:17 AM, Charlotte Bernard wrote:
Dear Freesurfer users,
I would like to know what is the level of smooth recommanded to use for surface-based group analysis? Thank you, All the best, Charlotte
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Hi Charlotte,
there's no one answer to this question. It depends on the spatial extent of the effect you are looking for, the level of noise, the number of subjects in your study, etc... A rule of thumb is the "matched filter theoreom" - you want the size of the smoothing kernel to be about the size of the effect you are looking for.
cheers Bruce On Tue, 17 Apr 2012, Charlotte Bernard wrote:
Dear Freesurfer users,
I would like to know what is the level of smooth recommanded to use for surface-based group analysis? Thank you, All the best, Charlotte
freesurfer@nmr.mgh.harvard.edu
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Bruce Fischl -
Charlotte Bernard -
Douglas N Greve