Hi all,
I had a quick question about smoothing when doing VBM. I've read on
Christian Gaser's VBM website (http://dbm.neuro.uni-jena.de/vbm/
segmentation/) down at the bottom of the page, that as a rule of
thumb, smoothing should be 70% lower than what your target smoothness
is (given you left the default cut off for spatial normalization at
25mm). So if for example, my target smoothness was 12mm FWHM, then I
should smooth my modulated gray matter images at around 8-9mm. Is
there anything out there published I can use to cite in a paper for
this "rule of thumb" or is this some esoteric thing that people who
use SPM have always done and just never bother to report it in
papers? I ask, because some of our reviewers want to know where is
the precedence for smoothing using this rule of thumb.
Thanks,
Mike
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