ENH: Add Shimadzu Labnirs 3-wavelength raw recording, in .snirf format #130
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larsoner
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Jan 5, 2026
Co-authored-by: Eric Larson <[email protected]>
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https://github.com/mne-tools/mne-testing-data/releases/tag/0.171 MD5: 138caf29bd8a9b0a6b6ea43d92c16201 |
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Test file required for mne-tools/mne-python#13408.
Some fNIRS data was recorded using a Shimadzu Labnirs device, then exported using the proprietary Labnirs software to a text file, which was then converted to .snirf with a custom converter (https://github.com/zEdS15B3GCwq/labnirs2snirf).
The data has 45 columns (15 S-D pairs * 3 wavelengths) and 250 time points. With a sampling rate around 20 Hz (19.6) the filter used in the scalp-coupling index calculation is >210 points long, so it's better to have more points than that to avoid a warning (and failed tests as a result).
Optode positions are "fake": optodes i and i+1 are 1 cm apart for the same types of optodes, and source i is 3 cm away from detector i.
Besides being unusual for having 3 wavelengths, another perhaps atypical feature is that the S-D pairs are not in increasing order: the first pair is S2-D2, then S1-S2, S1-D1, S9-D1, etc. This does not seem to cause any issues with processing.
The file is (to my knowledge) fully compliant with the SNIRF standard.