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Bug 2932 - channel neighbours for Yokogawa KIT system with 208 channels

Reported 2015-07-16 02:39:00 +0200
Modified 2016-05-09 08:46:18 +0200
Product: FieldTrip
Component: plotting
Version: unspecified
Hardware: Macintosh
Operating System: Mac OS
Importance: P5 normal
Assigned to: Jan-Mathijs Schoffelen
Depends on:
See also:

Teon - 2015-07-16 02:39:15 +0200

Created attachment 722 Sensor Connectivity matrix When I generate connectivity matrices for Yokogawa KIT files, the matrices have each sensor as its own neighbor. This was done using the triangulation method. According to the documentation, this should not be the case. I've attached a matrix for my system. I had to change the labels from AG to MEG to make it compatible for mne-python.

Robert Oostenveld - 2015-07-16 09:25:36 +0200

Hi Teon, I don't know what kind of system yours is. It seems to have 208 channels, which I have not seen before. There is mention of the system on If you look in ft_senstype, there is explicit mention of 9, 64, 160 and 440 channel yokogawa systems. I would not be sure whether channel types are correctly detected. Hence I am also not sure whether channel neighbours can be correctly detected. It is also not mentioned on I suggest you manually craft your neighbours, since you know best which channels are to be considered neighbours. If you want the system to be better supported in FieldTrip, you will have to share more details and a (preferably small) datafile with us.

Jan-Mathijs Schoffelen - 2016-03-08 12:35:39 +0100

Changing status for now. Feel free to re-open if there are new developments (e.g. some additional data to work with, or a better specification of the question).