moabb.datasets.Ortiz2023#

class moabb.datasets.Ortiz2023(subjects=None, sessions=None)[source]#

Bases: BaseDataset

[source]

Dataset Snapshot

Ortiz2023

EEG database for the cognitive assessment of motor imagery during walking with a lower-limb exoskeleton (DECODED, a EUROBENCH sub-project); flat-ground (EXPERIENCE) scenario.

Imagery, 3 classes (relax vs motor_imagery vs regressive_count)

AuthorsMario Ortiz, Luis de la Ossa, Eduardo Ianez, Diego Torricelli, Jesus Tornero, Jose M. Azorin

🇪🇸 Miguel Hernandez University of Elche, ES·2023
Imagery Code: Ortiz2023 10 subjects 1 session 31 ch (27 EEG) 200 Hz 3 classes 9.0 s trials CC BY 4.0

Class Labels: relax, motor_imagery, regressive_count

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Overview

Motor imagery during walking with a lower-limb exoskeleton

Able-bodied participants walked in a fully assisted H3 exoskeleton (DECODED / EUROBENCH), so motor_imagery is kinesthetic imagination of the gait, not its execution. Each open-loop trial is relax (402), gait imagery (404), regressive count (406), relax (402); the three classes come from the sample-wise task_EEG codes, so counts are unbalanced (32/16/16 per session). The paper's main contrast is relax vs motor_imagery.

Only the EXPERIENCE (flat-ground) scenario is loaded: one session per recording (M05 and M11 have two) with the 16 task trials as runs; the two resting baselines are skipped. The SLOPES scenario (variable-length trials, different codes, duplicated _sync files) is not loaded.

Paper-vs-release note: the paper reports fourteen able-bodied subjects over both scenarios, and its Table 1 lists nine Experience M-codes (M05-M11, M20, M21), three of them (M05, M08, M11) with two Experience weeks; M17 is listed there as the Slopes code of S4. This loader follows the released archive, which holds Experience task files for ten M-codes (including M17) and two recording dates for M05 and M11 only. The paper's Methods place the reference on the left (A1) and the ground on the right (A2) ear lobe, while the per-trial .json example lists the reference on the right and the ground on the left ear lobe.

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Citation & Impact

Stimulus Protocol
../_images/Ortiz2023.svg

9s task window per trial · 3-class imagery paradigm · 16 runs/session across 1 sessions

HED Event Tags
HED tags3/3 events annotated

Source: MOABB BIDS HED annotation mapping.

Label
3
Sensory-event
3
relax
Sensory-eventLabel
motor_imagery
Sensory-eventLabel
regressive_count
Sensory-eventLabel

HED tree view

Tree · relax
├─ Sensory-event
└─ Label
Tree · motor_imagery
├─ Sensory-event
└─ Label
Tree · regressive_count
├─ Sensory-event
└─ Label
Channel Summary
Total channels31
EEG27 (Ag/AgCl wet)
EOG4
Montage10-05
Sampling200 Hz
Referenceleft ear lobe (A1)
Filter0.1 Hz high-pass and 50 Hz notch (online, hardware)
Notch / line50 Hz

This diagram is automatically generated from MOABB metadata. Please consult the original publication to confirm the experimental protocol details.

Motor imagery during walking with a lower-limb exoskeleton [1].

Able-bodied participants walked in a fully assisted H3 exoskeleton (DECODED / EUROBENCH), so motor_imagery is kinesthetic imagination of the gait, not its execution. Each open-loop trial is relax (402), gait imagery (404), regressive count (406), relax (402); the three classes come from the sample-wise task_EEG codes, so counts are unbalanced (32/16/16 per session). The paper’s main contrast is relax vs motor_imagery.

Only the EXPERIENCE (flat-ground) scenario is loaded: one session per recording (M05 and M11 have two) with the 16 task trials as runs; the two resting baselines are skipped. The SLOPES scenario (variable-length trials, different codes, duplicated _sync files) is not loaded.

Paper-vs-release note: the paper reports fourteen able-bodied subjects over both scenarios, and its Table 1 lists nine Experience M-codes (M05-M11, M20, M21), three of them (M05, M08, M11) with two Experience weeks; M17 is listed there as the Slopes code of S4. This loader follows the released archive, which holds Experience task files for ten M-codes (including M17) and two recording dates for M05 and M11 only. The paper’s Methods place the reference on the left (A1) and the ground on the right (A2) ear lobe, while the per-trial .json example lists the reference on the right and the ground on the left ear lobe.

References

[1]

Ortiz, M., de la Ossa, L., Ianez, E., Torricelli, D., Tornero, J., & Azorin, J. M. (2023). An EEG database for the cognitive assessment of motor imagery during walking with a lower-limb exoskeleton. Scientific Data, 10, 343. https://doi.org/10.1038/s41597-023-02243-7

from moabb.datasets import Ortiz2023
dataset = Ortiz2023()
data = dataset.get_data(subjects=[1])
print(data[1])

Dataset summary

#Subj

10

#Chan

27

#Classes

3

#Trials / class

25.6

Trials length

9 s

Freq

200 Hz

#Sessions

1-2

#Runs

16

Total_trials

768

Participants

  • Population: healthy

  • Age: 28.7 years

Equipment

  • Amplifier: Brain Products actiCHamp

  • Electrodes: Ag/AgCl wet

  • Montage: standard_1005

  • Reference: left ear lobe (A1)

Data Access

Experimental Protocol

  • Paradigm: imagery

  • Stimulus: auditory

Notes

Added in version 1.8.

__init__(subjects=None, sessions=None)[source]#

Initialize function for the BaseDataset.

property all_subjects#

Full list of subjects available in this dataset (unfiltered).

convert_to_bids(path=None, subjects=None, overwrite=False, format='EDF', verbose=None, generate_figures=False)[source]#

Convert the dataset to BIDS format.

Saves the raw EEG data in a BIDS-compliant directory structure. Unlike the caching mechanism (see CacheConfig), the files produced here do not contain a processing-pipeline hash (desc-<hash>) in their names, making the output a clean, shareable BIDS dataset.

Parameters:

  • path (str | Path | None) – Directory under which the BIDS dataset will be written. If None the default MNE data directory is used (same default as the rest of MOABB).

  • subjects (list of int | None) – Subject numbers to convert. If None, all subjects in subject_list are converted.

  • overwrite (bool) – If True, existing BIDS files for a subject are removed before saving. Default is False.

  • format (str) – The file format for the raw EEG data. Supported values are "EDF" (default), "BrainVision", and "EEGLAB".

  • verbose (str | None) – Verbosity level forwarded to MNE/MNE-BIDS.

  • generate_figures (bool) – If True, generate interactive neural signature HTML figures in {bids_root}/derivatives/neural_signatures/. Requires plotly (pip install moabb[interactive]). Default is False.

Returns:

bids_root – Path to the root of the written BIDS dataset.

Return type:

pathlib.Path

Examples

>>> from moabb.datasets import AlexMI
>>> dataset = AlexMI()
>>> bids_root = dataset.convert_to_bids(path="/tmp/bids", subjects=[1])

Notes

Use CacheConfig to configure caching for get_data(). Use moabb.datasets.bids_interface.get_bids_root to get the BIDS root path.

Added in version 1.5.

data_path(subject, path=None, force_update=False, update_path=None, verbose=None)[source]#

Download the archive (once) and return the extraction directory.

download(subject_list=None, path=None, force_update=False, update_path=None, accept=False, verbose=None)[source]#

Download all data from the dataset.

This function is only useful to download all the dataset at once.

When the dataset declares a nemar_id and the download provider is not "upstream", the files come from NEMAR’s sourcedata/ – the original pre-BIDS distribution, byte-identical to what the upstream host serves. On any NEMAR failure this falls back to the dataset’s own downloader with a warning (unless the provider is pinned to "nemar"). See sourcedata_path() and moabb.set_download_provider().

Parameters:

  • subject_list (list of int | None) – List of subjects id to download, if None all subjects are downloaded. On the NEMAR path each subject is resolved through the deposit’s sourcedata_provenance.json; deposits enriched before that manifest recorded subjects fetch the whole tree.

  • path (None | str) – Location of where to look for the data storing location. If None, the environment variable or config parameter MNE_DATASETS_(dataset)_PATH is used. If it doesn’t exist, the “~/mne_data” directory is used. If the dataset is not found under the given path, the data will be automatically downloaded to the specified folder.

  • force_update (bool) – Force update of the dataset even if a local copy exists.

  • update_path (bool | None) – If True, set the MNE_DATASETS_(dataset)_PATH in mne-python config to the given path. If None, the user is prompted. Not used on the NEMAR path.

  • accept (bool) – Accept licence term to download the data, if any. Default: False. Only relevant to the dataset’s own downloader; NEMAR mirrors are already public.

  • verbose (bool, str, int, or None) – If not None, override default verbose level (see mne.verbose()).

get_additional_metadata(subject: str, session: str, run: str)[source]#

Load additional metadata for a specific subject, session, and run.

This method is intended to be overridden by subclasses to provide additional metadata specific to the dataset. The metadata is typically loaded from an events.tsv file or similar data source.

Parameters:

  • subject (str) – The identifier for the subject.

  • session (str) – The identifier for the session.

  • run (str) – The identifier for the run.

Returns:

A DataFrame containing the additional metadata if available, otherwise None.

Return type:

None | pandas.DataFrame

get_block_repetition(paradigm, subjects, block_list, repetition_list)[source]#

Select data for all provided subjects, blocks and repetitions.

subject -> session -> run -> block -> repetition

See also

get_data

Parameters:

  • subjects (List of int) – List of subject number

  • block_list (List of int) – List of block number

  • repetition_list (List of int) – List of repetition number inside a block

Returns:

data – dict containing the raw data

Return type:

Dict

get_data(subjects=None, cache_config=None, process_pipeline=None, n_jobs=1)[source]#

Return the data corresponding to a list of subjects.

The returned data is a dictionary with the following structure:

data = {"subject_id": {"session_id": {"run_id": run}}}

subjects are on top, then we have sessions, then runs. A sessions is a recording done in a single day, without removing the EEG cap. A session is constitued of at least one run. A run is a single contiguous recording. Some dataset break session in multiple runs.

Processing steps can optionally be applied to the data using the *_pipeline arguments. These pipelines are applied in the following order: raw_pipeline -> epochs_pipeline -> array_pipeline. If a *_pipeline argument is None, the step will be skipped. Therefore, the array_pipeline may either receive a mne.io.Raw or a mne.Epochs object as input depending on whether epochs_pipeline is None or not.

Parameters:

  • subjects (List of int) – List of subject number

  • cache_config (dict | CacheConfig) – Configuration for caching of datasets. See CacheConfig for details.

  • process_pipeline (sklearn.pipeline.Pipeline | None) – Optional processing pipeline to apply to the data. To generate an adequate pipeline, we recommend using moabb.make_process_pipelines(). This pipeline will receive mne.io.BaseRaw objects. The steps names of this pipeline should be elements of StepType. According to their name, the steps should either return a mne.io.BaseRaw, a mne.Epochs, or a numpy.ndarray. This pipeline must be “fixed” because it will not be trained, i.e. no call to fit will be made.

  • n_jobs (int) – Number of jobs to run in parallel over subjects (passed to joblib.Parallel). Default 1 (sequential). Per-subject processing (reading, filtering, resampling, epoching) is independent, so this gives a near-linear speedup for datasets with many subjects.

Returns:

data – dict containing the raw data

Return type:

Dict

property metadata[source]#

Return structured metadata for this dataset.

Returns the DatasetMetadata object from the centralized catalog, or None if metadata is not available for this dataset.

Returns:

The metadata object containing acquisition parameters, participant demographics, experiment details, and documentation. Returns None if no metadata is registered for this dataset.

Return type:

DatasetMetadata | None

Examples

>>> from moabb.datasets import BNCI2014_001
>>> dataset = BNCI2014_001()
>>> dataset.metadata.participants.n_subjects
9
>>> dataset.metadata.acquisition.sampling_rate
250.0
sourcedata_path(subject=None, path=None, force_update=False, verbose=None)[source]#

Get the dataset’s original pre-BIDS distribution from NEMAR.

Where data_path() fetches the original files from the upstream host, this fetches the copy NEMAR mirrors under sourcedata/. The files keep their upstream names, so the two are interchangeable in content – but NEMAR stays reachable when the upstream host is slow, rate-limited, behind a bot gate, or retired.

Parameters:

  • subject (int | str | None) – Restrict the download to one subject, resolved through the deposit’s sourcedata_provenance.json. Deposits enriched before that manifest recorded subjects fall back to the whole tree with a warning. When None the whole tree is fetched.

  • path (None | str) – Base path where MOABB stores datasets.

  • force_update (bool) – Re-fetch even when a local copy is present.

  • verbose (bool, str, int, or None) – If not None, override default verbose level.

Returns:

Local path to the sourcedata directory.

Return type:

str

Raises:

  • ValueError – If the dataset declares no nemar_id.

  • moabb.datasets.download.NemarDownloadError – If the download fails or the deposit publishes no sourcedata/.