Re: [Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-24 Thread Nicola Toschi
Thank you Rudolph, what I would like to have as an end product is a list of overlay values at each vertex of the decimated surface (i.e. I don't want to synthesize anything into ROIs). The overlays are all freesurfer-specific (curvature, thickness, LGI, etc). I cannot recompute these on the ne

Re: [Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-24 Thread Rudolph Pienaar
If you specifically want to project overlays onto 'mris_decimate'd surfaces, you won't be able to do that. You could, however, generate new overlays using the decimated surface, if that's helpful, using 'mris_curvature_stats' and feeding it the newly downsampled/demicated surface as input. FWI

Re: [Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-24 Thread Nicola Toschi
Hi Alex and Bruce, thanks a lot for your help. Will play around with MNE - looks like it does what I am looking for. Nicola On 01/24/2013 07:54 AM, Alexandre Gramfort wrote: > hi, > > what we do with MEG in the MNE package is indeed store downsampled > overlays (that actually have a temporal di

Re: [Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-23 Thread Alexandre Gramfort
hi, what we do with MEG in the MNE package is indeed store downsampled overlays (that actually have a temporal dimension). More specifically we store the values e.g. only at the vertices of the ico5 subdivision and store the ico 5 vertex indices and overlay values. Then to display them on the high

Re: [Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-23 Thread Bruce Fischl
Hi Nicola I think this gets done in the MEG analysis stream, but perhaps Matti (ccd) can comment. cheers BruceOn Thu, 24 Jan 2013, Nicola Toschi wrote: > Hello list, > > is there a quick way to decimate an overlay /while respecting surface > geomery)? I am looking to downsample by about a facto

[Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-23 Thread Nicola Toschi
Hello list, is there a quick way to decimate an overlay /while respecting surface geomery)? I am looking to downsample by about a factor 100. Alternatively, I know I can use mris_decimate to downsample a surface, but I would have to project my highres overlays onto the downsampled surface (w

[Freesurfer] Downsampling/decimating overlays (not surfaces)

2013-01-22 Thread Nicola Toschi
Hello list, is there a quick way to decimate an overlay /while respecting surface geomery)? I am looking to downsample by about a factor 100. Alternatively, I know I can use mris_decimate to downsample a surface, but I would have to project my highres overlays onto the downsampled surface (w