I actually don't know if your information is out of data. I remember years ago we did do some checking on it, and I thought it was accurate (can't find my notes not it). If it is not accurate, I would like to know. Alternatively, you can report mni305 coordinates.

doug

Matt Leonard wrote:

Hi Doug,

Thanks for the reply. I looked at Matthew Brett's transform, which I understand to be a non-linear transform between MNI and Talairach, but I was told that tksurfer's "Talairach" field is not accurate. Is this simply because Brett's transform is only one of many possible solutions to the problem, or is it because of something else? Or is my information out of date? If the Talairach field in tksurfer is accurate enough to report in a paper, then I'm happy to go with that.

Thanks,

Matt

On Aug 19, 2009, at 7:11 PM, Douglas N Greve wrote:

...

THere are two sets of coordinates that are reportable. First, the mni305. This is the coordinate system that we use internally (eg, surface coords of fsaverage are stored in mni305). We can convert these coords to "talairach" thru Matthew Brett's transform. This is what is reported in the "Talairach" field in tkmedit and tksurfer. Does this answer your question?

doug

Matt Leonard wrote:

...

Hi,

I've been asked to report Talairach coordinates in a paper, but I've been told that the coordinates that are listed on the fsaverage brain (in the talairach.xfm file) are not accurate. Does anyone have a way to get the true Talairach coordinates on the fsaverage brain?

Thanks,

Matt

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