EEGdash›NeMAR›NM000167

Iss. 167 · 25 subjects · 375 recordings · CC-BY-4.0

Dataset Brief · Motor imagery dataset from Ma et al. 2020

NM000167: eeg dataset, 25 subjects#

Motor imagery dataset from Ma et al. 2020

Citation: Xuelin Ma, Shuang Qiu, Changde Du, Junfeng Xing, Huiguang He (2019). Motor imagery dataset from Ma et al. 2020. 10.82901/nemar.nm000167

25-participant EEG dataset — Motor imagery dataset from Ma et al. 2020.

Data & curation Xuelin Ma · Shuang Qiu · Changde Du · Junfeng Xing · Huiguang He
Year 2019 · Distributed via NeMAR
Funding National Key Research and Development Plan of China (No. 2017YFB1002502) · National Natural Science Foundation of China (No. 61976209) · + 1 more

EEG · 64 (225), 62 (150) ch1000 HzBIDS 1.9.0Task · imagery15 sessionsHealthyVisualMotor

Layer 01Study

What was asked

Hypothesis, independent & dependent variables, paradigm, cohort, and the editorial caveats around what the recordings can and cannot answer.

Layer 02Signal · BIDS

What was recorded

Sidecars, channels & electrodes, coordinate system, event semantics, and quality stats from the NEMAR pipeline when available.

Layer 03Training · ML

What you can train on

Recommended access modes — MNE Raw, braindecode windows, PyTorch DataLoader — plus the targets the metadata makes addressable.

§ 01Access · Get started

Quickstart#

Get Started

Install

pip install eegdash

Access the data

from eegdash.dataset import NM000167

dataset = NM000167(cache_dir="./data")
# Get the raw object of the first recording
raw = dataset.datasets[0].raw
print(raw.info)

Query & Filter

Filter by subject

dataset = NM000167(cache_dir="./data", subject="01")

Advanced query

dataset = NM000167(
    cache_dir="./data",
    query={"subject": {"$in": ["01", "02"]}},
)

Iterate recordings

for rec in dataset:
    print(rec.subject, rec.raw.info['sfreq'])

Cite This Dataset

If you use this dataset in your research, please cite the original authors.

BibTeX

@dataset{nm000167,
  title = {Motor imagery dataset from Ma et al. 2020},
  author = {Xuelin Ma and Shuang Qiu and Changde Du and Junfeng Xing and Huiguang He},
  doi = {10.82901/nemar.nm000167},
  url = {https://doi.org/10.82901/nemar.nm000167},
}

§ 02Study · The README

About This Dataset#

Motor imagery dataset from Ma et al. 2020.

Schema: HED 8.4.0 | Browse: https://www.hedtags.org/hed-schema-browser

DOI

Motor imagery dataset from Ma et al. 2020

right_hand

View full README

DOI

Motor imagery dataset from Ma et al. 2020

right_hand

     ├─ Sensory-event, Experimental-stimulus, Visual-presentation
     └─ Agent-action
        └─ Imagine
           ├─ Move
           └─ Right, Hand

right_elbow

├─ Sensory-event
└─ Label/right_elbow

Paradigm-Specific Parameters

Detected paradigm: motor_imagery
Imagery tasks: right_hand, right_elbow
Cue duration: 1.0 s
Imagery duration: 4.0 s

Data Structure

Trials: 600
Trials per class: right_hand=300, right_elbow=300
Blocks per session: 15
Trials context: 3 days x 5 MI sessions/day = 15 sessions, 40 trials/session (20 hand + 20 elbow)

Signal Processing

Classifiers: FBCSP+SVM
Feature extraction: FBCSP
Frequency bands: alpha=[8.0, 13.0] Hz; beta=[20.0, 25.0] Hz
Spatial filters: CAR, FBCSP

Cross-Validation

Method: 5-fold
Folds: 5
Evaluation type: within_subject

BCI Application

Applications: motor_rehabilitation, prosthetic_control
Environment: laboratory
Online feedback: False

Tags

Pathology: healthy
Modality: motor
Type: imagery

Documentation

DOI: 10.1038/s41597-020-0535-2
License: CC-BY-4.0
Investigators: Xuelin Ma, Shuang Qiu, Changde Du, Junfeng Xing, Huiguang He
Senior author: Huiguang He
Institution: Chinese Academy of Sciences
Department: Institute of Automation
Country: CN
Repository: Harvard Dataverse
Data URL: https://doi.org/10.7910/DVN/RBN3XG
Publication year: 2020
Funding: National Key Research and Development Plan of China (No. 2017YFB1002502); National Natural Science Foundation of China (No. 61976209); National Natural Science Foundation of China (No. 61906188)
Ethics approval: Ethics Committee of the Institute of Automation, Chinese Academy of Sciences
Keywords: motor imagery, EEG, BCI, same limb, hand, elbow

References

X. Ma, S. Qiu, C. Du, J. Xing, and H. He, “Multi-channel EEG recording during motor imagery of different joints from the same limb,” Scientific Data, vol. 7, no. 1, p. 191, 2020. DOI: 10.1038/s41597-020-0535-2 Appelhoff, S., Sanderson, M., Brooks, T., Vliet, M., Quentin, R., Holdgraf, C., Chaumon, M., Mikulan, E., Tavabi, K., Hochenberger, R., Welke, D., Brunner, C., Rockhill, A., Larson, E., Gramfort, A. and Jas, M. (2019). MNE-BIDS: Organizing electrophysiological data into the BIDS format and facilitating their analysis. Journal of Open Source Software 4: (1896). https://doi.org/10.21105/joss.01896 Pernet, C. R., Appelhoff, S., Gorgolewski, K. J., Flandin, G., Phillips, C., Delorme, A., Oostenveld, R. (2019). EEG-BIDS, an extension to the brain imaging data structure for electroencephalography. Scientific Data, 6, 103. https://doi.org/10.1038/s41597-019-0104-8 Generated by MOABB 1.5.0 (Mother of All BCI Benchmarks) NeuroTechX/moabb

§ 03Cohort · Participants

Cohort#

Dataset Statistics#

Age distribution by gender (n=25, range 23–29 yr, mean 25.5 yr)

2025

Female · 7Male · 18

Sex composition

Female
7
Male
18
F : M ratio
0.39 : 1

28% female · n = 25 subjects with reported sex.

HandednessRight · 25

Channel counts (ch)

6264

Sampling frequencies: 1000.0 Hz (n=375 recordings)

Total recording duration: 35 h

§ 04Signal · Electrodes & trace

Signal · Electrodes & live trace#

Fig. 01 Signal & montage 64 (225), 62 (150) ch · EEG · 1000 Hz · 25 subjects, 375 recordings

Live trace viewer — sub-13 · ses-10 · task-imagery · run-0

Showing one representative recording out of 25 subjects and 375 recordings in this dataset. Browse the full set on OpenNeuro; drop any other _eeg.{set,edf,bdf,vhdr} file onto the viewer (or pass ?eeg=<url>) to inspect it.

Electrode layout — EEG · 64 sensors — 64 channels

NEMAR Processing Statistics#

The plots below are generated by NEMAR’s automated EEG pipeline. The histogram shows pipeline success for data cleaning and ICA decomposition, the percentage of data frames and EEG channels retained after artefact removal, line noise per channel (RMS, dB), and the age/gender distribution of participants.

HED event descriptors word cloud

§ 05Manifest · BIDS tree

Manifest#

File Explorer#

Browse the BIDS file structure of this dataset. Records are fetched on demand from the EEGDash catalog the first time you open the explorer.

Recordings—

Files—

Subjects—

Modalities—

Click to load file structure…

§ 06API · Programmatic access

API Reference#

Signature

eegdash.dataset

class

eegdash.dataset.NM000167(cache_dir, query=None, s3_bucket=None, **kwargs)

Bases: EEGDashDataset

Author (year)Ma2020

Canonical—

Importable asNM000167 · Ma2020

Sourceeegdash/dataset/registry.py · [source ↗]

class eegdash.dataset.NM000167(cache_dir: str, query: dict | None = None, s3_bucket: str | None = None, **kwargs)[source]#

Motor imagery dataset from Ma et al. 2020

Study:: nm000167 (NeMAR)
Author (year):: Ma2020
Canonical:: —

Also importable as: NM000167, Ma2020.

Modality: eeg; Experiment type: Motor; Subject type: Healthy. Subjects: 25; recordings: 375; tasks: 1.

Parameters:

cache_dir (str | Path) – Directory where data are cached locally.
query (dict | None) – Additional MongoDB-style filters to AND with the dataset selection. Must not contain the key dataset.
s3_bucket (str | None) – Base S3 bucket used to locate the data.
**kwargs (dict) – Additional keyword arguments forwarded to EEGDashDataset.

data_dir#

Local dataset cache directory (cache_dir / dataset_id).

Type:: Path

query#

Merged query with the dataset filter applied.

Type:: dict

records#

Metadata records used to build the dataset, if pre-fetched.

Type:: list[dict] | None

Notes

Each item is a recording; recording-level metadata are available via dataset.description. query supports MongoDB-style filters on fields in ALLOWED_QUERY_FIELDS and is combined with the dataset filter. Dataset-specific caveats are not provided in the summary metadata.

References

OpenNeuro dataset: https://openneuro.org/datasets/nm000167 NeMAR dataset: https://nemar.org/dataexplorer/detail?dataset_id=nm000167 DOI: https://doi.org/10.82901/nemar.nm000167

Examples

>>> from eegdash.dataset import NM000167
>>> dataset = NM000167(cache_dir="./data")
>>> recording = dataset[0]
>>> raw = recording.load()

__init__(cache_dir: str, query: dict | None = None, s3_bucket: str | None = None, **kwargs)[source]#

save(path: str, overwrite: bool = False, offset: int = 0)[source]#

Save datasets to files by creating one subdirectory for each dataset:

path/
    0/
        0-raw.fif | 0-epo.fif
        description.json
        raw_preproc_kwargs.json (if raws were preprocessed)
        window_kwargs.json (if this is a windowed dataset)
        window_preproc_kwargs.json  (if windows were preprocessed)
        target_name.json (if target_name is not None and dataset is raw)
    1/
        1-raw.fif | 1-epo.fif
        description.json
        raw_preproc_kwargs.json (if raws were preprocessed)
        window_kwargs.json (if this is a windowed dataset)
        window_preproc_kwargs.json  (if windows were preprocessed)
        target_name.json (if target_name is not None and dataset is raw)

Parameters:

path (str) –

Directory in which subdirectories are created to store
-raw.fif | -epo.fif and .json files to.
overwrite (bool) – Whether to delete old subdirectories that will be saved to in this call.
offset (int) – If provided, the integer is added to the id of the dataset in the concat. This is useful in the setting of very large datasets, where one dataset has to be processed and saved at a time to account for its original position.

Access modesMNE → braindecode → PyTorch → ML

.rawMNE Raw object — standard tools (filter, epoch, ICA, plot_psd).mne

BaseConcatDatasetEach record is a lazy BaseDataset from braindecode — windowed via create_windows_from_events.braindecode

DataLoaderWraps the windowed dataset into a PyTorch DataLoader; supports parallel workers and on-the-fly augmentations.pytorch

Zarr cacheOptional braindecode Zarr mirror for fast resume; persisted to cache_dir.zarr

Hugging FaceNo per-dataset mirror published yet — browse the EEGDash org listing for sibling datasets. See the datasets loader API.huggingface

Croissant 1.0Machine-readable JSON-LD descriptor — NM000167.croissant.json (MLCommons schema, ingestible by PyTorch / TensorFlow / JAX).mlcommons

Examples using EEGDashcurated · start here

Find datasets with the EEGDash APIQuery the catalogue, filter by task or modality, list candidates.

Load one EEG recordingResolve a single record to an MNE Raw with channels and events.

EEG recording to PyTorch DataLoaderWrap braindecode windows in a DataLoader for model training.

Preprocess EEG and create windowsFilter, resample, epoch — and persist the windowed dataset.

Save and reload prepared dataCache a windowed dataset to disk and reattach it without recompute.

Download a dataset locallyPrefetch BIDS files to a local cache and validate the layout.

Swap any load_dataset(...) call for nm000167 to reproduce the tutorial on this dataset.

Citation

Xuelin Ma, Shuang Qiu, Changde Du, Junfeng Xing, Huiguang He (2019). Motor imagery dataset from Ma et al. 2020. 10.82901/nemar.nm000167

Provenance

¹Contributed to nemar in BIDS format.

²Curated & ingested by the EEGDash catalog; see CITATION.cff for canonical reference.

³Persistent identifier: 10.82901/nemar.nm000167.

Related & sibling datasets

NM000311EEG · 25 subj NM000209EEG · 25 subj NM000160EEG · 18 subj NM000265EEG · 31 subj NM000227EEG · 31 subj

+ 1 more — see See Also below →

BIDS

BIDS 1.9.0

Sidecars

events · events.json · channels · eeg.json

Provenance

CC-BY-4.0 · 10.82901/nemar.nm000167

Machine-readable

schema.org/Dataset · Croissant

Mirrors

OpenNeuro · NEMAR · HF org

Dataset ID	`NM000167`
Title	Motor imagery dataset from Ma et al. 2020
Author (year)	`Ma2020`
Canonical	—
Importable as	`NM000167`, `Ma2020`
Year	2019
Authors	Xuelin Ma, Shuang Qiu, Changde Du, Junfeng Xing, Huiguang He
License	CC-BY-4.0
Citation / DOI	10.82901/nemar.nm000167
Source links	OpenNeuro \| NeMAR \| Source URL

NM000167: eeg dataset, 25 subjects#

Quickstart#

About This Dataset#

Cohort#

Dataset Statistics#

Signal · Electrodes & live trace#

NEMAR Processing Statistics#

Manifest#

File Explorer#

API Reference#

Citation

Provenance

Related & sibling datasets

See Also#