[Mne_analysis] Using mne_annot2labels

[Matti Hamalainen]

On Feb 17, 2009, at 9:01 PM, supra at nmr.mgh.harvard.edu wrote:

> Hi folks,
>
>    I am trying to convert freesurfer parcellation data into labels  
> using
> mne_annot2labels(Page 241 of Manual) command. The command ran, however
> the
> converted label files when opened in text editor showed a row of  4  
> zeros
> next to each vertex (meaning it did not look like a typical label file
> which has the 3 coordinates corresponding to the vertex). Any help on
> successful use of this command will be appreciated.
>
> Our aim is to load these converted labels  using mne_analyze and  
> also to
> compute the lead field matrices for each of these labels using
> mne_forward_solution script. My expectation was that converted labels
> using this command could be viewed  in the same way as manually  
> created
> labels (described in 7.13.4 of manual). Is this correct?

Do not worry about the zeros, they are immaterial to MNE, only the  
vertex numbers (first column) count. It is normal that  
mne_annot2labels writes these zeros.

Incidentally, the FreeSurfer parcellation most probably too coarse to  
be used as parcels of the source space.

- Matti