MNE-NIRS: montage and plot_topo of GLM results

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Dear all,

  • MNE version: 1.6.1
  • MNE-NIRS version: 0.6.0
  • operating system: linux CentOS 7

I am trying to process old NIRx data.
I managed to convert the data from .nirs to .snirf format.

I created a montage from the optodes and fiducials locations I had (X, Y, Z coordinates in MNI space) using mne.channels.make_dig_montage and set_montage, and the position of the optodes looks correct when I use montage.plot():

image
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I then computed the haemoglobin data and solved a very simple GLM (it’s just a finger-tapping task alternating with rest). I tried to plot the GLM parameters using plot_topo(conditions=['Task'])
but the channel positions are not correct at all, I obtain such plots:

image

How can my custom montage be recognized by plot_topo()? I understand that plot_topo() needs a layout as input, not a montage, so how can I obtain a layout information from a custom montage?

Thanks in advance for your help
Melanie