EEGdash›NeMAR›ON002712

Iss. 2712 · 25 subjects · 82 recordings · CC0

Dataset Brief · Numbers and Letters

ON002712: meg dataset, 25 subjects#

Numbers and Letters

Access recordings and metadata through EEGDash.

Citation: Sara Aurtenetxe, Nicola Molinaro, Doug Davidson, Manuel Carreiras (—). Numbers and Letters. 10.82901/nemar.on002712

Modality: meg Subjects: 25 Recordings: 82 License: CC0 Source: nemar

Metadata: Complete (100%)

25-participant MEG dataset — Numbers and Letters.

Data & curation Sara Aurtenetxe · Nicola Molinaro · Doug Davidson · Manuel Carreiras
Senior author Manuel Carreiras

MEG · 312 (79), 361 (2), 314 ch1000 HzBIDS 1.1.1Task · numbersletters

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 ON002712

dataset = ON002712(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 = ON002712(cache_dir="./data", subject="01")

Advanced query

dataset = ON002712(
    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{on002712,
  title = {Numbers and Letters},
  author = {Sara Aurtenetxe and Nicola Molinaro and Doug Davidson and Manuel Carreiras},
  doi = {10.82901/nemar.on002712},
  url = {https://doi.org/10.82901/nemar.on002712},
}

§ 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:

DOI

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

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-17 · task-numbersletters · run-21

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.

No scalp electrode layout is currently indexed for this dataset. Once the eegdash montage registry ingests it, the interactive viewer will appear here automatically.

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.ON002712(cache_dir, query=None, s3_bucket=None, **kwargs)

Bases: EEGDashDataset

Author (year)—

Canonical—

Importable asON002712

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

class eegdash.dataset.ON002712(cache_dir: str, query: dict | None = None, s3_bucket: str | None = None, **kwargs)[source]#

Numbers and Letters

Study:: on002712 (NeMAR)
Author (year):: —
Canonical:: —

Also importable as: ON002712.

Modality: meg; Subject type: Unknown. 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/on002712 NeMAR dataset: https://nemar.org/dataexplorer/detail?dataset_id=on002712 DOI: https://doi.org/10.82901/nemar.on002712

Examples

>>> from eegdash.dataset import ON002712
>>> dataset = ON002712(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 — ON002712.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 on002712 to reproduce the tutorial on this dataset.

Citation

Sara Aurtenetxe, Nicola Molinaro, Doug Davidson, Manuel Carreiras (n.d.). Numbers and Letters. 10.82901/nemar.on002712

Provenance

¹Contributed to nemar in BIDS format.

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

³Persistent identifier: 10.82901/nemar.on002712.

Related & sibling datasets

ON007640MEG · 23 subj ON007663MEG · 27 subj ON003483MEG · 21 subj ON003694MEG · 28 subj ON003703MEG · 34 subj

+ 1 more — see See Also below →

BIDS

BIDS 1.1.1

Sidecars

events · channels

Provenance

CC0 · 10.82901/nemar.on002712

Machine-readable

schema.org/Dataset · Croissant

Mirrors

OpenNeuro · NEMAR · HF org

Dataset ID	`ON002712`
Title	Numbers and Letters
Author (year)	—
Canonical	—
Importable as	`ON002712`
Year	—
Authors	Sara Aurtenetxe, Nicola Molinaro, Doug Davidson, Manuel Carreiras
License	CC0
Citation / DOI	10.82901/nemar.on002712
Source links	OpenNeuro \| NeMAR \| Source URL

ON002712: meg 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#