What’s new?#

Version 0.20 (2026-09-28)#

The following authors contributed for the first time. Thank you so much! 🤩

The following authors had contributed before. Thank you for sticking around! 🤘

Clarify that the tracking_system parameter of mne_bids.BIDSPath and the tracking_systems parameter of mne_bids.find_matching_paths() correspond to the Motion-BIDS tracksys entity, by Daria Agafonova (#1562)
Add support for writing eyetracking data with mne_bids.write_raw_bids() (new eyetrack_calibration parameter) and for updating calibration metadata with mne_bids.physio.write_eyetrack_calibration(), by Scott Huberty (#1642)
Add mne_bids.read_epochs_bids() to read epoched BIDS recordings ("RecordingType": "epoched") as mne.Epochs; mne_bids.read_raw_bids() now raises a helpful error for such recordings, by Bruno Aristimunha (#1605)

Added extra_params parameter to mne_bids.write_raw_bids(), allowing users to pass split size in the extra_params dictionary to control the size of split fif files by Erica Peterson (#1660)

Building the documentation now requires pydata-sphinx-theme 0.22 or higher, by Eric Larson (#1669)

Accept the ASCII unit alias uV in channels.tsv files, by Bruno Aristimunha (#1654)
Preserve the actual root of files returned by mne_bids.BIDSPath.match(), avoiding duplicate paths and paths that do not exist when matching inside nested BIDS roots, by Daria Agafonova (#1637)
mne_bids.write_raw_bids() no longer raises a TypeError when writing ANT Neuro eego recordings (.cnt), by Vincent Gao (#1617)
Allow empty room files over 2GB in size to be written with mne_bids.write_raw_bids(), by Erica Peterson (#1660)

Sped up writing of recordings with many channels by avoiding redundant per-channel work in mne_bids.write_raw_bids() (single-pass channel-type counting, cached coil-type lookup, and a fixed quadratic loop when writing BrainVision units), by Stefan Appelhoff (#1620)
Run the test suite with pytest-xdist and build the documentation with parallel Sphinx and Sphinx-Gallery workers, by Eric Larson (#1648)
Sped up mne_bids.BIDSPath.copy(), mne_bids.BIDSPath.fpath when the suffix or extension has to be inferred from the filesystem, and import mne_bids (roughly 2.5x faster), which no longer eagerly imports MNE’s preprocessing, visualization, or file-format reader modules, nor SciPy, by Eric Larson (#1657)
Deploy the documentation with docstacks: maint/X.Y branches now publish and promote their own docs, the version switcher is updated automatically, and the release workflow asks conda-forge for a version bump, by Eric Larson (#1669)