[Mne_analysis] Generating a smooth surface source model covering the superficial parts, but excluding the cerebellum

[Burkhard Maess]

Dear MNE experts,

for the analysis of some data for which we do not have individual MRI scans, we plan to use the Montreal data set colin27 instead. The dataset passed the freesurfer segmentation and although freesurfer has estimated the folded cortical surface for colin we would avoid using it as our participants most likely have different cortical foldings. Instead, we would prefer using a smooth surface positioned so that it covers the superficial parts of the cortex and ignores deeper structures. One solution is to take the inner skull surface, shrink it by e.g. 10 mm or so. Of course, we will not restrict the estimated activity to the surface normals of this non-folded surface. However, for the inferior parts of the cortex this solution is not optimal as it includes the cerebellum. 
Hence, our question: Has somebody else used such a non-folded source space? Could you create a single surface source space which covers the outer volumes of the cerebrum excluding the cerebellum? Any suggestions are welcome.

best wishes and thanx in advance,
Burkhard (& Narjes)



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Dr. Burkhard Maess
Max Planck Institute for Human Cognitive and Brain Sciences
Stephanstr. 1a, P.O. Box 500355, D-04303 Leipzig
Aussenstelle Bennewitz, phone/fax: +493425 8875-2526/-2511   mail: maess 'at' cbs.mpg.de,           http://www.cbs.mpg.de