[FieldTrip] weird topo: due to missing sensors? and [Reference to non-existent field 'chanori']

Vitoria Piai v.piai.research at gmail.com
Fri Sep 19 01:13:14 CEST 2014

Hello FT-ers,

I was wondering whether anyone has an idea of what could be going on in 
this topo of the group-averaged ERF (difference between 2 conditions, 
planar gradient). At first I thought that could be muscle activity, but 
that pattern seems to hold regardless of the time window I choose (and 
besides when I plot the EMG of some facial muscles, they don't differ 
from each other...).
What I noted now is that different sensors were excluded for different 
participants around those areas so I'm suspecting that the missing 
sensors are causing the problem (because of the way the data is 
interpolated for plotting?).

I tried different options in ft_topoplot but all my attempts were in vain.
Next, I tried using ft_channelrepair. I assumed that the correct order 
of processing steps would be to repair channels first, and then 
calculate planar gradients after. If I follow that procedure, I get the 
following error when running ft_megplanar (FT version 20140518):
Reference to non-existent field 'chanori'.

Error in ft_megplanar (line 242)
   chanposnans = any(isnan(sens.chanpos(:))) || any(isnan(sens.chanori(:)));

If anyone could shed some light on these issues, it would be great!
Thanks a lot,
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