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

Laetitia Grabot laetitia.grabot at gmail.com
Thu Nov 10 09:15:52 EST 2016
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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

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