It is context dependent. When the output is the volume, it does volume smoothing. When the output is the surface, it does surface smoothing. The surface smoothing is better for surfaces because it excludes non-gray tissue types and does not smooth across gyri/sulci. How much better? I don't have any numbers on that.

doug

On 8/22/10 12:17 PM, Shahin wrote:

Hi,

In version 5.0 it is mentioned that "- fwhm-surf" is obsolete (I know it is still available). I want to know what "- fwhm" option exactly do when I have already mentioned that I want a surface only processing (by using "-surface self lhrh"). Does it do smoothing on the basis of volume or surface and how significant the difference is?

Regards
Shahin Nasr

PhD in Cognitive Neuroscience
Martinos Imaging Center, MGH
Harvard Medical School
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