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[FIX] Clarify that electrodes.tsv is optional for MEG, for use with simultaneous (i)EEG #1555

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merged 4 commits into from
Aug 24, 2023

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effigies
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Fixes #1550.

@effigies effigies added MEG Magnetoencephalography EEG Electroencephalography schema Issues related to the YAML schema representation of the specification. Patch version release. labels Jul 14, 2023
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codecov bot commented Jul 14, 2023

Codecov Report

Patch and project coverage have no change.

Comparison is base (334dd36) 87.83% compared to head (2facc67) 87.83%.
Report is 31 commits behind head on master.

❗ Current head 2facc67 differs from pull request most recent head 3772352. Consider uploading reports for the commit 3772352 to get more accurate results

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##           master    #1555   +/-   ##
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  Coverage   87.83%   87.83%           
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  Files          16       16           
  Lines        1356     1356           
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  Hits         1191     1191           
  Misses        165      165           

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@robertoostenveld robertoostenveld left a comment

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I approve.

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@sappelhoff sappelhoff left a comment

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Thanks @effigies!

Let's wait for further discussion based on my comment in:

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(placing this here as a visual block, as this is not yet ready IMHO)

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What do you think about this?

perhaps we should add a section about electrodes.tsv to the MEG section of the BIDS specification, and make corresponding schema adjustments.

I see that you have opted for not adding a new section and instead adding this information under Recording EEG simultaneously with MEG. I think I'd be fine with that as well.

@@ -0,0 +1,14 @@
# Rules for MEG data that cannot be defined in tables
---
MEGElectrodesRecommended:
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as outlined in #1550 (comment), I think this should be optional --> this electrode information can also be stored in _headshape.<ext> files or sometimes in the data file format itself (Elekta/Neuromag/MEGIN).

@@ -98,8 +98,10 @@ it SHOULD be stored separately under a new `/eeg` data type
If however EEG is recorded simultaneously **with the same MEG system**,
it MAY be stored under the `/meg` data type.
In that case, it SHOULD have the same sampling frequency as MEG (see `SamplingFrequency` field below).
Furthermore, the EEG sensor coordinates SHOULD be specified using MEG-specific coordinate
systems (see [coordinates section](#coordinate-system-json-_coordsystemjson) below and
Furthermore, EEG sensor coordinates SHOULD be recorded in an
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IMHO the SHOULD should become a MAY.

So far, the spec allowed for recording electrode positions in the _headshape: https://bids-specification.readthedocs.io/en/stable/glossary.html#headshape-suffixes

@effigies effigies changed the title [FIX] Clarify that electrodes.tsv is recommended for simultaneous MEG/EEG [FIX] Clarify that electrodes.tsv is optional for MEG, for use with simultaneous (i)EEG Aug 24, 2023
@effigies effigies merged commit 02d97b0 into bids-standard:master Aug 24, 2023
22 of 23 checks passed
@effigies effigies deleted the fix/meg_electrodes branch August 24, 2023 18:01
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electrodes.tsv for simultaneous MEG/EEG data
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