Carolina,
It means its smoothing on the surface with a kernel of 10mm full-width half-max. Smoothing on the surface can generally be larger than in a volume. See these slides for a description of the difference:
http://surfer.nmr.mgh.harvard.edu/pub/docs/fs.surface-based-analysis.ppt
you can use a lower fwhm, it just depends on your expected blob size (there is no formula for the 'right' smoothing level).
Nick
Hello,
<div>In the qdec analysis the default smoothing factor is 10. What does it mean? For other technics such as fMRI we generally use a lower smoothing factor (~3 or lower). What would happen if I low down the FWHM?</div> <div>Thank you, Carolina</div> _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer