Hi Douglas,

I am using the cortical surface for MEG time series reconstruction. I need to know which vertices belong to a specific area, i.e. vertices that belong to the PCC, AG... I got the surfaces from the HCP which has 4.002 vertices in each subject, then I decimated with mris_decimate 0.25, getting 1.000 vertices. The problem is that the atlas is in this 4.002 vertices space, and I want to downsample it to 1.002. Is there a way to downsample the atlas in an mgh overlay format?

One work around that I thought is getting the 4k vertices coordinates and the 1k vertices coordinates and find the nearest vertices in the 4k.

Thanks

Dorothy

On Mon, May 15, 2017 at 6:49 PM, Douglas Greve <greve@nmr.mgh.harvard.edu> wrote:

I don't understand what you are trying to do. Can you elaborate? Sending command lines is always helpful

On 5/15/17 6:50 PM, Dorothy Sincasto wrote:
Hi freesurfers,

I have an overlay with 4k vertices and I want to decimate it to 1k. This overlay is actually an atlas with a label value for each vertex. My surfaces will have 1k vertices and I need the overlay to 1k so I know which areas each vertex belong to.

I tried to decimate the atlas.mgh but it gives me this error:

ERROR: MRISread: file '/Users/dsinc35/Desktop/projects/parcellation/MMP_atlas_L.mgh' has 0 vertices! Probably trying to use a scalar data file as a surface!

Maybe there is a way to project it?

Any thoughts?

Thanks,

Dorothy
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