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

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Aug 24, 2023
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[FIX] Clarify that electrodes.tsv is optional for MEG, for use with simultaneous (i)EEG #1555

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d04ffe0
[FIX] Clarify that electrodes.tsv is permissible for simultaneous MEG…
effigies Jul 14, 2023
b5a222a
[SCHEMA] Permit electrodes.tsv for MEG
effigies Jul 14, 2023
befd54c
[SCHEMA] electrodes.tsv is RECOMMENDED if EEGChannelCount > 0
effigies Jul 14, 2023
3772352
Address review
effigies Aug 24, 2023
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15 changes: 9 additions & 6 deletions src/modality-specific-files/magnetoencephalography.md
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Expand Up @@ -89,17 +89,20 @@ which some installations impose to be run on raw data prior to analysis.
Such processing steps are needed for example because of active shielding software corrections
that have to be performed to before the MEG data can actually be exploited.

### Recording EEG simultaneously with MEG
### Recording (i)EEG simultaneously with MEG

Note that if EEG is recorded with a separate amplifier,
Note that if (i)EEG is recorded with a separate amplifier,
it SHOULD be stored separately under a new `/eeg` data type
(see [the EEG specification](electroencephalography.md)).
(see the [EEG](electroencephalography.md) and
[iEEG](intracranial-electroencephalography.md) specifications).

If however EEG is recorded simultaneously **with the same MEG system**,
If however (i)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, (i)EEG sensor coordinates MAY be recorded in an
[`electrodes.tsv`](electroencephalography.md#electrodes-description-_electrodestsv)
file using MEG-specific coordinate systems
(see [Coordinate System JSON](#coordinate-system-json-_coordsystemjson) below and
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the [Coordinate Systems Appendix](../appendices/coordinate-systems.md)).

### Sidecar JSON (`*_meg.json`)
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9 changes: 9 additions & 0 deletions src/schema/rules/files/raw/channels.yaml
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Expand Up @@ -72,6 +72,15 @@ electrodes:
acquisition: optional
space: optional

# MEG has an additional entity available
electrodes__meg:
$ref: rules.files.raw.channels.electrodes
datatypes:
- meg
entities:
$ref: rules.files.raw.channels.electrodes.entities
processing: optional

optodes:
suffixes:
- optodes
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