BIDS

BIDS (Brain Imaging Data Structure) provides a standard way to organize MEG data for conversion, sharing, and downstream analysis; see the BIDS website for the full MEG specification.

BIDS on SPICE

See general steps (0 to 2) on: BIDS on SPICE

The notes below cover the NatMEG-specific parts of the later workflow.

3. Set MEG-BIDS configurations

Most important is to set names of the tasks. If not using default names of conversion table and config settings, you can also modify those.

Task names are the harmonized names that you want to have in your final BIDS structure. When running the analysis in the next step all tasks not matching the names in this field will be marked as "check" and require a manual handling before conversion.

4. Editor

Run analysis or load existing conversion table by pressing Analyze / Refresh . This will scan your files, converted and newly added and suggest BIDS conversion parameters.

File can be marked as:

run: file ready to be converted

check: file needs to be checked, edit manually

processed: file is already converted

skip: do not process file

missing: source file does not exist

error: conversion failed

You can use search and filters to see relevant entries. For editing click a row and you will be able to edit all BIDS fields for that entry.

Batch processing

You can rename files and change status in batch by marking the header check box. Filter the relevant files and mark all and change status or name, you will need to do this one at the time.

Context check

Often when you have deviant files you would like to see the other files from that subject and session. By clicking Context check you get an automatic filter for that. This is useful if filenames have multiple runs but this information is embedded in the name.

5. Make BIDS

When done editing and no more files are marked "Check", then you can run the conversion.