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MEG experimental data often comes with an associated "empty-room" recording, which is supposed to capture the signal recorded with no participant present.
BIDS allows to indicate which empty-room recording belongs to an experimental recording via the AssociatedEmptyRoom key in *_meg.json. Specifically, the specs state the following:
Relative path in BIDS folder structure to empty-room file associated with the subject’s MEG recording. The path needs to use forward slashes instead of backward slashes (for example, "sub-emptyroom/ses-/meg/sub-emptyroom_ses-_task-noise_run-_meg.ds").
Two questions came to my mind:
The path is supposed to be "relative", but it's unclear to me what the reference point is supposed to be. Intuitively, I assumed it's either the location of *_meg.json, or of the experimental recording. However, the path in the example seems to be relative to the BIDS root. What is the correct way to specify AssociatedEmptyRoom?
The path in the example has empty ses and run entities. I didn't know this was even valid. Is that a mistake?
Hello,
MEG experimental data often comes with an associated "empty-room" recording, which is supposed to capture the signal recorded with no participant present.
BIDS allows to indicate which empty-room recording belongs to an experimental recording via the
AssociatedEmptyRoom
key in*_meg.json
. Specifically, the specs state the following:Two questions came to my mind:
*_meg.json
, or of the experimental recording. However, the path in the example seems to be relative to the BIDS root. What is the correct way to specifyAssociatedEmptyRoom
?ses
andrun
entities. I didn't know this was even valid. Is that a mistake?For reference, this is the schema currently used for validation of
AssociatedEmptyRoom
. It's … under-complex and therefore didn't provide me with any additional clues:https://github.com/bids-standard/bids-validator/blob/2f0ca2458cff47e1fd1f898c3a81aef370558085/bids-validator/validators/json/schemas/meg.json#L48-L59
Thanks for you help,
Richard
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