EEGdash›OpenNeuro›DS002712
Iss. 2712 · 25 subjects · 82 recordings · CC0
Dataset Brief · Numbers and Letters

DS002712: meg dataset, 25 subjects#

Numbers and Letters

Citation: Sara Aurtenetxe, Nicola Molinaro, Doug Davidson, Manuel Carreiras (—). Numbers and Letters. 10.18112/openneuro.ds002712.v1.0.1

25-participant MEG dataset — Numbers and Letters.

Data & curation Sara Aurtenetxe · Nicola Molinaro · Doug Davidson · Manuel Carreiras
MEG · 312 (79), 361 (2), 314 ch1000 HzBIDS 1.1.1Task · numberslettersHealthyVisualPerception
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#

Install

pip install eegdash

Access the data

from eegdash.dataset import DS002712

dataset = DS002712(cache_dir="./data")
# Get the raw object of the first recording
raw = dataset.datasets[0].raw
print(raw.info)

Filter by subject

dataset = DS002712(cache_dir="./data", subject="01")

Advanced query

dataset = DS002712(
    cache_dir="./data",
    query={"subject": {"$in": ["01", "02"]}},
)

Iterate recordings

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

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

BibTeX

@dataset{ds002712,
  title = {Numbers and Letters},
  author = {Sara Aurtenetxe and Nicola Molinaro and Doug Davidson and Manuel Carreiras},
  doi = {10.18112/openneuro.ds002712.v1.0.1},
  url = {https://doi.org/10.18112/openneuro.ds002712.v1.0.1},
}
§ 02Study · The README

About This Dataset#

OpenNeuro curator note: This dataset was previously accessible at ds001985. The dataset was reuploaded due to privacy considerations.

The experiment is composed by two runs

We here report the code triggers for each run:

Run 1: single item 10 = single numbers 15 = single letters 20 & 25 = single false fonts Run 2: strings 35 = strings numbers 40 = strings letters 45 & 50 = strings false fonts raw files could be split into two files (e.g., run-1 + run-11)

§ 03Cohort · Participants

Cohort#

Dataset Statistics#

Age distribution (n=28, range 20–29 yr, mean 24.0 yr · sex per subject not reported)

2025

Sex composition

28
subjects
Female
14
Male
14
F : M ratio
1.00 : 1
50% female · n = 28 subjects with reported sex.

Channel counts (ch)

312314361

Sampling frequencies: 1000.0 Hz (n=82 recordings)

Total recording duration: 24 h

§ 04Signal · Electrodes & trace

Signal · Electrodes & live trace#

Fig. 01 Signal & montage 312 (79), 361 (2), 314 ch · MEG · 1000 Hz · 25 subjects, 82 recordings
Live trace viewer — sub-13 · task-numbersletters · run-11

Showing one representative recording out of 25 subjects and 82 recordings in this dataset. Browse the full set on OpenNeuro; drop any other _meg.{set,edf,bdf,vhdr} file onto the viewer (or pass ?meg=<url>) to inspect it.

Electrode layout — MEG · 306 sensors — 306 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.

NEMAR pipeline statistics — DS002712
HED event descriptors word cloud HED event descriptors word cloud — DS002712
§ 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…
Full dataset metadata table

Dataset ID

DS002712

Title

Numbers and Letters

Author (year)

Aurtenetxe2020

Canonical

—

Importable as

DS002712, Aurtenetxe2020

Year

—

Authors

Sara Aurtenetxe, Nicola Molinaro, Doug Davidson, Manuel Carreiras

License

CC0

Citation / DOI

10.18112/openneuro.ds002712.v1.0.1

Source links

OpenNeuro | NeMAR | Source URL
Copy-paste BibTeX
@dataset{ds002712,
  title = {Numbers and Letters},
  author = {Sara Aurtenetxe and Nicola Molinaro and Doug Davidson and Manuel Carreiras},
  doi = {10.18112/openneuro.ds002712.v1.0.1},
  url = {https://doi.org/10.18112/openneuro.ds002712.v1.0.1},
}
§ 06API · Programmatic access

API Reference#

Signature
eegdash.dataset
class
eegdash.dataset.DS002712(cache_dir, query=None, s3_bucket=None, **kwargs)
Bases: EEGDashDataset
Author (year)Aurtenetxe2020
Canonical—
Importable asDS002712 · Aurtenetxe2020
Sourceeegdash/dataset/registry.py · [source ↗]
class eegdash.dataset.DS002712(cache_dir: str, query: dict | None = None, s3_bucket: str | None = None, **kwargs)[source]#

Numbers and Letters

Study:

ds002712 (OpenNeuro)

Author (year):

Aurtenetxe2020

Canonical:

—

Also importable as: DS002712, Aurtenetxe2020.

Modality: meg; Experiment type: Perception; Subject type: Healthy. Subjects: 25; recordings: 82; 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/ds002712 NeMAR dataset: https://nemar.org/dataexplorer/detail?dataset_id=ds002712 DOI: https://doi.org/10.18112/openneuro.ds002712.v1.0.1 NEMAR citation count: 1

Examples

>>> from eegdash.dataset import DS002712
>>> dataset = DS002712(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 FacePre-bundled mirror at EEGDash/ds002712 · pull with datasets.load_dataset("EEGDash/ds002712").huggingface
Croissant 1.0Machine-readable JSON-LD descriptor — DS002712.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 ds002712 to reproduce the tutorial on this dataset.

Citation

Sara Aurtenetxe, Nicola Molinaro, Doug Davidson, Manuel Carreiras (n.d.). Numbers and Letters. 10.18112/openneuro.ds002712.v1.0.1

Provenance

¹Contributed to openneuro in BIDS format.

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

³Persistent identifier: 10.18112/openneuro.ds002712.v1.0.1.

BIDS
BIDS 1.1.1
Sidecars
events · channels
Machine-readable
schema.org/Dataset · Croissant

See Also#