The reduction of tile areas should be nonuniform, because areas of cortex that are more anatomically variable will not line up, and the features will smooth each other out due to not being matched. I don't think surface area is particularly meaningful on an average surface.
Tim On Wed, Feb 20, 2013 at 10:35 PM, Tristan Chaplin <tristan.chap...@gmail.com > wrote: > Thanks Time. > > If I wanted to measure areas on this human cortex model, do you think it's > ok to first scale the surface model up to this 965cm2 area? Or is the > reduction in surface area too variable over the surface (ie not uniform)? > > Cheers, > Tristan > > > On Thu, Feb 21, 2013 at 8:56 AM, Timothy Coalson <tsc...@mst.edu> wrote: > >> The surface generated as the average of all subjects in the atlas is >> significantly smoother than any individual's surface, which reduces >> the surface area. This may account for the discrepancy, as what >> appears to be reported by the paper you saw is the mean of the surface >> areas of the individuals, rather than the surface area of the average >> surface. >> >> Tim >> >> On Tue, Feb 19, 2013 at 8:08 PM, Tristan Chaplin >> <tristan.chap...@gmail.com> wrote: >> > Sorry that should be 565 cm2. >> > >> > >> > On Wed, Feb 20, 2013 at 12:25 PM, Tristan Chaplin >> > <tristan.chap...@gmail.com> wrote: >> >> >> >> Hi, >> >> >> >> I have been looking at the surface area of the PALS atlas and am a bit >> >> confused as it seems smaller than I expected. The spec file >> >> >> >> PALS_B12.RIGHT.STANDARD-SCENES.73730.spec >> >> >> >> downloaded from >> >> >> >> >> >> >> http://sumsdb.wustl.edu:8081/sums/archivelist.do?archive_id=6570866&archive_name=PALS_B12.RIGHT.STANDARD-SCENES.73730.spec >> ) >> >> >> >> seems to have a fiducial surface area of 565 mm2 (including >> non-cortical >> >> medial wall) but the Van Essen 2005 Neuroimage paper says the average >> >> surface area of the individuals is 965 cm2. >> >> >> >> Am I doing something wrong, or is there is something about atlas >> building >> >> that causes this? >> >> >> >> Thanks, >> >> Tristan >> >> >> >> >> >> >> >> >> > >> > >> > _______________________________________________ >> > caret-users mailing list >> > caret-users@brainvis.wustl.edu >> > http://brainvis.wustl.edu/mailman/listinfo/caret-users >> > >> _______________________________________________ >> caret-users mailing list >> caret-users@brainvis.wustl.edu >> http://brainvis.wustl.edu/mailman/listinfo/caret-users >> > > > _______________________________________________ > caret-users mailing list > caret-users@brainvis.wustl.edu > http://brainvis.wustl.edu/mailman/listinfo/caret-users > >
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