on004011
NEMAR copy of ds004011

The nature of neural object representations during dynamic occlusion

This magnetoencephalography (MEG) dataset investigates neural object representations during dynamic visual occlusion. Participants viewed objects that were either occluded or disappeared while their neural activity and eye movements were recorded. The dataset includes raw MEG data, behavioral responses, eye-tracking recordings, and preprocessed neural signals epoched relative to stimulus onset and position changes, enabling investigation of how the brain maintains object representations under conditions of visual disruption.

BEH MEG
Issues GitHub OpenNeuro ds004011

Download this dataset

dataset 257.7 GB exceeds 100.0 GB archive limit; use direct download. Use one of the streaming methods below — all resumable. Full download guide →

  1. NEMAR CLI recommended

    Pulls the pinned version + annexed data and resumes cleanly. Install nemar-cli → 

    nemar dataset download on004011
  2. DataLad

    Clone the dataset repo and fetch file content on demand. Docs → 

    datalad clone https://github.com/nemarDatasets/on004011 on004011
cd on004011 && datalad get .
  3. git-annex

    Plain git + git-annex against the dataset repo. Docs → 

    git clone https://github.com/nemarDatasets/on004011 on004011
cd on004011 && git annex get .
  4. Direct files (wget / curl / rclone)

    Every file with a stable, range-resumable URL from the manifest. Needs curl, jq, wget (or rclone/aria2c). Docs → 

    curl -s https://data.nemar.org/on004011/v1.0.0/manifest.json | jq -r '.[].bytes_url' > urls.txt
wget -xc -i urls.txt

Compute on this dataset

Two routes today, with a third (in-browser one-click submission) landing soon.

  1. NeuroScience Gateway (NSG) portal.

    NSG runs EEGLAB / Brainstorm / MNE pipelines on supercomputing time donated by SDSC. Create an account, point a job at this dataset's S3 prefix (s3://nemar/on004011), and submit.
    nsgportal.org →

  2. Local processing with nemar-cli.

    Pull the dataset to your machine and run any toolbox locally. Honors the published version pinning. 

    npm install -g nemar-cli
nemar dataset clone on004011
cd on004011 && nemar dataset get
  3. Just the files.

    rclone, aria2c, or any HTTPS client works against data.nemar.org/on004011/ — the manifest carries presigned S3 URLs.

Direct compute access is coming soon. One-click NSG submission from this page is scoped for a follow-up phase. Tracked on nemarOrg/website#6.

Citations

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    Files

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    Signal viewer
    How to use the data (for agentic research) license, citation, download commands

    What it is

    Modalities
    BEH, MEG
    Participants
    27
    Size
    258 GB
    Tasks
    occlusion

    License and terms

    License
    CC0
    Recommended citation
    Teichmann, L., Moerel, D., Rich, A., & Baker, C. (2026). The nature of neural object representations during dynamic occlusion (Version v1.0.0) [Data set]. NEMAR. https://doi.org/10.82901/nemar.on004011
    Reference 1
    https://doi.org/10.21105/joss.01896
    Reference 2
    https://doi.org/10.1038/sdata.2018.110

    Where the bytes are

    Latest version (always current)
    https://data.nemar.org/on004011/latest/
    This version (v1.0.0)
    https://data.nemar.org/on004011/v1.0.0/

    How to download

    The dataset
    nemar dataset download on004011 Clones and fetches in one step. Content under stimuli/ and derivatives/ is skipped by default because those trees can be large; add --stimuli --derivatives for the whole thing.
    A subset, one step
    nemar dataset download on004011 --subjects sub-01,02 Also filters by --sessions, --tasks, --runs, --datatypes, --include and --exclude.
    A subset, step 1
    nemar dataset clone on004011 Clones git-annex pointers only; fetches no file content. Creates ./on004011.
    A subset, step 2
    cd on004011 The get command below reads the clone's annex, so it only works from inside the clone.
    A subset, step 3
    nemar dataset get <files> Pulls the files you actually need. Skips stimuli/ and derivatives/ unless the path you ask for is under one of them.
    One small file
    https://data.nemar.org/on004011/v1.0.0/participants.tsv A direct HTTPS fetch works for any single file.

    Assess fit without downloading

    Participants table
    https://data.nemar.org/on004011/v1.0.0/participants.tsv
    Dataset description
    https://data.nemar.org/on004011/v1.0.0/dataset_description.json
    Directory listing
    https://data.nemar.org/on004011/v1.0.0/?format=json
    Catalog record
    https://api.nemar.org/datasets/on004011