Summary

This came up in mne-tools/mne-bids#592

According to the spec: https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/04-intracranial-electroencephalography.html#electrode-description-_electrodestsv

ieeg can have subject/session/space for electrodes.tsv.

while eeg can have subject/session/acquisition/run for electrodes.tsv (and maybe space?)

https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/03-electroencephalography.html#electrodes-description-_electrodestsv

Is this correct?

Proposed Solution

My understanding is that you only need one electrodes.tsv/coordsystem.json per session directory because all the electrodes/channels are the same "within the same session" for iEEG. So you can have multiple tasks, runs, acquisitions, etc.

But I suppose this might be different for say scalp EEG based on reading the above? Either way some clarification would help immensely.

Based on the discussion for the above, I can make a subsequent PR if it is deemed appropriate.