[Mne_analysis] Fwd: smooth parameter in morph_data: default to change?

dgw dgwakeman at gmail.com
Thu Nov 10 09:29:46 EST 2016
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Hi Laetitia,

I think it would be best to take a step back and see how you got these
results. I have a number of questions.

1. How did you produce the individual result? This looks very odd to
me (it seems to only show activity in very narrow strips, which is

2. Have you checked the FreeSurfer segmentation and labels to
fsaverage? (The data seem to be rotated somehow).

3. Can you provide an abbreviated version the code you used to produce
this affect?


On Thu, Nov 10, 2016 at 9:15 AM, Laetitia Grabot
<laetitia.grabot at gmail.com> wrote:
> Dear MNE-users,
> I would like to draw your attention on the importance of the smooth
> parameter used to morph a source estimate from an individual's brain to an
> average brain (fsaverage). By default, this parameter is set to None and the
> doc precised that, in this case, the smooth parameter is automatically
> defined to fill the surface with non-zeros value. Yet, it happen to me that
> the produced source estimates are sometimes unreliable.
> I attached snapshot where you can see data (here PSD) in the visual cortex
> (nativeBrain). These data are correctly morphed into fsaverage brain when
> the smooth parameter is set to 1. However, the source estimate created with
> smooth=None does not make sense.
> Maybe it would be better than the default parameter is set to 1 and not to
> None, or at least that a warning informs which smooth parameter was finally
> used.
> Best,
> Laetitia
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