moabb.datasets.GrosseWentrup2009#

class moabb.datasets.GrosseWentrup2009(subjects=None, sessions=None)[source]#

Bases: BaseDataset

[source]

Dataset Snapshot

GrosseWentrup2009

Motor Imagery, 2 classes (right_hand vs left_hand)

AuthorsMoritz Grosse-Wentrup, Christian Liefhold, Klaus Gramann, Martin Buss

🇩🇪 Technische Universität München, DE·2009·moritzgw@ieee.org
Motor Imagery Code: GrosseWentrup2009 10 subjects 1 session 128 ch 500 Hz 2 classes 10.0 s trials CC BY 4.0

Class Labels: right_hand, left_hand

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Overview

Munich Motor Imagery dataset.

Motor imagery dataset from Grosse-Wentrup et al. 2009

A trial started with the central display of a white fixation cross. After 3 s, a white arrow was superimposed on the fixation cross, either pointing to the left or the right. Subjects were instructed to perform haptic motor imagery of the left or the right hand during display of the arrow, as indicated by the direction of the arrow. After another 7 s, the arrow was removed, indicating the end of the trial and start of the next trial. While subjects were explicitly instructed to perform haptic motor imagery with the specified hand, i.e., to imagine feeling instead of visualizing how their hands moved, the exact choice of which type of imaginary movement, i.e., moving the fingers up and down, gripping an object, etc., was left unspecified. A total of 150 trials per condition were carried out by each subject, with trials presented in pseudorandomized order.

Ten healthy subjects (S1–S10) participated in the experimental evaluation. Of these, two were females, eight were right handed, and their average age was 25.6 years with a standard deviation of 2.5 years. Subject S3 had already participated twice in a BCI experiment, while all other subjects were naive to BCIs. EEG was recorded at M=128 electrodes placed according to the extended 10–20 system. Data were recorded at 500 Hz with electrode Cz as reference. Four BrainAmp amplifiers were used for this purpose, using a temporal analog high-pass filter with a time constant of 10 s. The data were re-referenced to common average reference offline. Electrode impedances were below 10 kΩ for all electrodes and subjects at the beginning of each recording session. No trials were rejected and no artifact correction was performed. For each subject, the locations of the 128 electrodes were measured in three dimensions using a Zebris ultrasound tracking system and stored for further offline analysis.

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Benchmark Context

WithinSession

Included in 1 MOABB benchmark table(s). Scores are across available pipelines (WithinSession accuracy).

Sample frame: 10 subjects × 1 sessions

  • MI left vs right 19 pipelinesMax 89.25 · Median 79.65 · Mean 79.02 · Std 8.66

Citation & Impact

  • Paper DOI10.1109/TBME.2008.2009768
  • CitationsLoading…
  • Public APICrossref | OpenAlex
  • MOABB tables1 (WithinSession)
  • Page Views
    30d: 36 · all-time: 456
    #22 of 151 · Top 15% most viewed
    Updated: 2026-03-20 UTC
Stimulus Protocol
../_images/GrosseWentrup2009.svg

10s task window per trial · 2-class motor imagery paradigm · 1 runs/session across 1 sessions

HED Event Tags
HED tags2/2 events annotated

Source: MOABB BIDS HED annotation mapping.

Agent-action
2
Sensory-event
2
left_hand
Sensory-eventAgent-action
right_hand
Sensory-eventAgent-action

HED tree view

Tree · left_hand
├─ Sensory-event
│  ├─ Experimental-stimulus
│  ├─ Visual-presentation
│  └─ Leftward
│     └─ Arrow
└─ Agent-action
   └─ Imagine
      ├─ Move
      └─ Left
         └─ Hand
Tree · right_hand
├─ Sensory-event
│  ├─ Experimental-stimulus
│  ├─ Visual-presentation
│  └─ Rightward
│     └─ Arrow
└─ Agent-action
   └─ Imagine
      ├─ Move
      └─ Right
         └─ Hand
Channel Summary
Total channels128
EEG128
Montagestandard_1020
Sampling500 Hz
ReferenceCz
Filter{'highpass_time_constant_s': 10}
Notch / line50 Hz

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

Munich Motor Imagery dataset.

Motor imagery dataset from Grosse-Wentrup et al. 2009 [1].

A trial started with the central display of a white fixation cross. After 3 s, a white arrow was superimposed on the fixation cross, either pointing to the left or the right. Subjects were instructed to perform haptic motor imagery of the left or the right hand during display of the arrow, as indicated by the direction of the arrow. After another 7 s, the arrow was removed, indicating the end of the trial and start of the next trial. While subjects were explicitly instructed to perform haptic motor imagery with the specified hand, i.e., to imagine feeling instead of visualizing how their hands moved, the exact choice of which type of imaginary movement, i.e., moving the fingers up and down, gripping an object, etc., was left unspecified. A total of 150 trials per condition were carried out by each subject, with trials presented in pseudorandomized order.

Ten healthy subjects (S1–S10) participated in the experimental evaluation. Of these, two were females, eight were right handed, and their average age was 25.6 years with a standard deviation of 2.5 years. Subject S3 had already participated twice in a BCI experiment, while all other subjects were naive to BCIs. EEG was recorded at M=128 electrodes placed according to the extended 10–20 system. Data were recorded at 500 Hz with electrode Cz as reference. Four BrainAmp amplifiers were used for this purpose, using a temporal analog high-pass filter with a time constant of 10 s. The data were re-referenced to common average reference offline. Electrode impedances were below 10 kΩ for all electrodes and subjects at the beginning of each recording session. No trials were rejected and no artifact correction was performed. For each subject, the locations of the 128 electrodes were measured in three dimensions using a Zebris ultrasound tracking system and stored for further offline analysis.

References

[1]

Grosse-Wentrup, Moritz, et al. “Beamforming in noninvasive brain–computer interfaces.” IEEE Transactions on Biomedical Engineering 56.4 (2009): 1209-1219.

from moabb.datasets import GrosseWentrup2009
dataset = GrosseWentrup2009()
data = dataset.get_data(subjects=[1])
print(data[1])

Dataset summary

#Subj

10

#Chan

128

#Classes

2

#Trials / class

150

Trials length

7 s

Freq

500 Hz

#Sessions

1

#Runs

1

Total_trials

3000

Participants

  • Population: healthy

  • Age: 25.6 years

  • Handedness: {‘right’: 8}

  • BCI experience: mixed

Equipment

  • Amplifier: BrainAmp

  • Montage: standard_1020

  • Reference: Cz

Preprocessing

  • Data state: preprocessed

  • Re-reference: car

  • Notes: No trials were rejected and no artifact correction was performed. Data were re-referenced to common average reference offline.

Data Access

  • DOI: 10.1109/TBME.2008.2009768

  • Repository: Zenodo

Experimental Protocol

  • Paradigm: imagery

  • Task type: motor_imagery

  • Tasks: motor_imagery

  • Feedback: none

  • Stimulus: arrow_cue

Notes

Note

GrosseWentrup2009 was previously named MunichMI. MunichMI will be removed in version 1.1.

__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])

See also

CacheConfig

Cache configuration for get_data().

moabb.datasets.bids_interface.get_bids_root

Return the BIDS root path.

Notes

Added in version 1.5.

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

Get path to local copy of a subject data.

Parameters:

  • subject (int) – Number of subject to use

  • 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 Deprecated) – If True, set the MNE_DATASETS_(dataset)_PATH in mne-python config to the given path. If None, the user is prompted.

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

Returns:

path – Local path to the given data file. This path is contained inside a list of length one, for compatibility.

Return type:

list of str

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.

Parameters:

  • subject_list (list of int | None) – List of subjects id to download, if None all subjects are downloaded.

  • 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.

  • accept (bool) – Accept licence term to download the data, if any. Default: False

  • 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) → None | DataFrame[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 | pd.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

BaseDataset.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)[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 (Pipeline | None) – Optional processing pipeline to apply to the data. To generate an adequate pipeline, we recommend using moabb.utils.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.

Returns:

data – dict containing the raw data

Return type:

Dict

property metadata: DatasetMetadata | None[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