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Hi Markus, I'm not familiar with a simple and principled way to downsample the cortical mesh, at least not something in SPM. Those meshes were prepared originally with freesurfer and there might be a way to downsample them there or just prepare lower resolution meshes from scratch. Rik Henson and Daniel Wakeman should be able to advise you. Best, Vladimir On Fri, May 28, 2010 at 7:32 PM, Markus Bauer <[log in to unmask]> wrote: > Hi Vladimir > > I wonder whether it would be easily possible to (further) downsample an > existing MNI grid > the coarsest grid possible in SPM seems to be ~5000 points whcih is still a > lot, possibly a higher resolution that one might need (and leading to an > enhanced MCP) > I realized that when subsampling the grid (taking e.g. only every 4th vertex > from the usual 8000 grid) leaves the distance relations approximately > preserved (i.e. the grid is still somewhat regular). So this could be a very > rough way of doing it - and for display purposes extrapolating again > > But would it be possible to either make a coarser grid from the beginning - > or do you know how I can get new 'faces' - ie the connection surfaces of the > subsampled grid? > Any idea on this? > > thanks > Markus > > >