It's an optic chiasm, crossing of optic nervers.

Martin

Sent from my iPad

On 19.7.2013, at 20:28, ye tian <tianye730@gmail.com> wrote:

> Dear freesurfers,
>
> I would like to confirm that the circled region in whitematter.png is not white matter. I initially manually deleted the white matter in wm.mgz for a few subjects. Now I see that it is such a common problem and I start to loose confidence in my editing. Would anyone please give me a second opinion?
>
> Thank you very much!
>
> Sincerely,
> Ye

> <white matter.png>
> <Freesurfer.png>
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