{"dataset":{"id":"59508","dataset_id":"on004951","name":"Braille letters - EEG","description":"This dataset contains raw EEG recordings from participants performing a Braille letter discrimination task, in which Braille letters were presented to the left and right index fingers via Braille cells. The data were collected to investigate the transformation of sensory to perceptual representations of Braille letters in the visually deprived brain. Recordings were made using BrainVision hardware and are organized following the BIDS-EEG standard. For some participants, EEG recording was stopped and restarted within a session, resulting in separate runs, and some participants completed a second session.","owner_user_id":15,"status":"active","github_repo":"nemarDatasets/on004951","concept_doi":"10.82901/nemar.on004951","latest_version_doi":"10.82901/nemar.on004951.v1.0.0","created_at":"2026-06-26 00:01:46","updated_at":"2026-08-19 02:18:04","zenodo_concept_id":null,"is_sandbox":0,"visibility":"public","ezid_status":"public","enrichment_json":"{\n  \"version\": \"2.0\",\n  \"pipeline_stage\": \"enriched\",\n  \"title\": \"Braille letters - EEG\",\n  \"description\": \"This dataset contains raw EEG recordings from participants performing a Braille letter discrimination task, in which Braille letters were presented to the left and right index fingers via Braille cells. The data were collected to investigate the transformation of sensory to perceptual representations of Braille letters in the visually deprived brain. Recordings were made using BrainVision hardware and are organized following the BIDS-EEG standard. For some participants, EEG recording was stopped and restarted within a session, resulting in separate runs, and some participants completed a second session.\",\n  \"methods_description\": \"EEG data were recorded using BrainVision equipment (.eeg, .vhdr, .vmrk files). Stimuli consisted of Braille letters (B, C, D, L, M, N, V, Z) presented on Braille cells under the left and right index fingers of participants. Trigger codes distinguished stimulus laterality (S1-8 for left hand, S9-16 for right hand) as well as trial events such as trial onset, stimulus onset, catch trials, and pedal press responses (correct/incorrect). Some participants completed multiple runs or sessions due to interruptions in recording.\",\n  \"license\": \"CC0\",\n  \"dataset_type\": \"raw\",\n  \"authors\": {\n    \"Marleen Haupt\": {},\n    \"Monika Graumann\": {},\n    \"Santani Teng\": {},\n    \"Carina Kaltenbach\": {},\n    \"Radoslaw M. Cichy\": {}\n  },\n  \"keywords\": [\n    {\n      \"term\": \"EEG\"\n    },\n    {\n      \"term\": \"Braille\"\n    },\n    {\n      \"term\": \"Blindness\",\n      \"subject_scheme\": \"MeSH\",\n      \"value_uri\": \"http://id.nlm.nih.gov/mesh/D001766\"\n    },\n    {\n      \"term\": \"tactile perception\"\n    },\n    {\n      \"term\": \"sensory processing\"\n    },\n    {\n      \"term\": \"perceptual representation\"\n    },\n    {\n      \"term\": \"visually deprived\"\n    },\n    {\n      \"term\": \"Braille reading\"\n    },\n    {\n      \"term\": \"BrainVision\"\n    },\n    {\n      \"term\": \"BIDS\"\n    }\n  ],\n  \"related_identifiers\": [\n    {\n      \"identifier\": \"https://github.com/nemarDatasets/on004951\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"10.21105/joss.01896\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"References\"\n    },\n    {\n      \"identifier\": \"10.1038/s41597-019-0104-8\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"References\"\n    },\n    {\n      \"identifier\": \"10.18112/openneuro.ds004951.v1.0.0\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDerivedFrom\"\n    },\n    {\n      \"identifier\": \"https://nemar.org/dataset/on004951\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"10.82901/nemar.on004951\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDescribedBy\"\n    }\n  ],\n  \"funding_references\": [\n    {\n      \"funder_name\": \"DFG\",\n      \"award_number\": \"CI241/1-1\"\n    },\n    {\n      \"funder_name\": \"DFG\",\n      \"award_number\": \"CI241/3-1\"\n    },\n    {\n      \"funder_name\": \"DFG\",\n      \"award_number\": \"CI241/7-1\"\n    },\n    {\n      \"funder_name\": \"ERC\",\n      \"award_number\": \"ERC-StG-2018-803370\"\n    }\n  ],\n  \"resource_type_general\": \"Dataset\",\n  \"resource_type_specific\": \"EEG Dataset\",\n  \"modalities\": [\n    \"eeg\"\n  ],\n  \"sizes\": [\n    \"23.6 GB (70 files)\"\n  ],\n  \"formats\": [\n    \".eeg\",\n    \".json\",\n    \".md\",\n    \".tsv\",\n    \".vhdr\",\n    \".vmrk\",\n    \".yml\"\n  ],\n  \"source_hash\": \"09ba2e586a3a6b781fe6c1323f423e468ebf88bf1906b1332ebaa451213bf118\"\n}","last_activity_at":"2026-06-26 00:01:46","source":"openneuro","source_id":"ds004951","subject_count":11,"modalities":"eeg","age_min":29,"age_max":61,"file_size":23627355638,"total_files":204,"tasks":"letters","metadata_columns_error":null,"staleness_warn_stage":null,"staleness_admin_notified_at":null,"authors":"Marleen Haupt, Monika Graumann, Santani Teng, Carina Kaltenbach, Radoslaw M. Cichy","license":"CC0","readme":"[![DOI](https://img.shields.io/badge/DOI-10.82901%2Fnemar.on004951-blue)](https://doi.org/10.82901/nemar.on004951)\n\nThis dataset contains the raw EEG data accompanying the paper \"The transformation of sensory to perceptual braille letter representations in the visually deprived brain\". Please cite the above paper if you use this data.\n\nThe dataset includes:\n\nBrainvision files (.eeg, .vhdr, .vmrk) for all participants.\n\nPlease note, for some participants the EEG decording had to be stopped and restarted within a session. In this case, the different files are indicated as separate runs. In addition, some participants completed a second session.\n\nThe events files contain the onsets, durations, trial types and values for all trials in the corresponding run. Stimuli are Braille letters (B,C,D,L,M,N,V,Z) presented on Braille cells under the left and right index fingers of participants. Triggers S1-8 are letters presented to the left hand, triggers S9-16 are letters presented to the right hand. \n\nOther triggers:\n\nstarttrigger         = S100;\ntrialonset           = S101;\nstimulusonset        = S222;\ncatchtrial           = S200;\npedalpress_correct   = S253;\npedalpress_incorrect = S254;\nendtrigger           = S255;\n\n\nFor a full description of the paradigm and the employed procedures please see the paper.  \n\nReferences for MNE BIDS conversion\n----------\nAppelhoff, S., Sanderson, M., Brooks, T., Vliet, M., Quentin, R., Holdgraf, C., Chaumon, M., Mikulan, E., Tavabi, K., Höchenberger, 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\n\nPernet, 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\n\n","bids_version":"1.7.0","sessions_count":2,"publish_date":null,"embedding_dirty":0,"license_tier":"public","zarr_status":"ready","zarr_converted_at":"2026-08-21 00:16:21","zarr_store_count":23,"zarr_index_etag":"7476da8890266a02935452026ba501ca","zarr_source_commit":"d1ed39fc6bfb1fd94ff49e41c701f4284a009fcb","archive_status":"ready","archive_size":18175227043,"archive_retry_count":0,"records_status":"ready","archive_skip_reason":null,"zarr_errors":0,"zarr_failure_count":0,"zarr_deterministic":0,"zarr_failed_at":null,"num_dataset_citations":4,"num_datapaper_citations":0,"n_channels":63,"electrode_system":"10-10","has_hed":0,"hed_version":null,"is_exemplar":0,"bytes_present":23619232442,"data_complete":1,"withdrawn_at":null,"withdrawn_reason":null,"archive_complete":null,"archive_absent_files":null,"archive_declared_files":null,"zarr_pool_breaks":null,"total_recording_duration":92835.148,"recording_duration_min":135.62,"recording_duration_max":5816.76,"recording_count":23,"recordings_unavailable":0,"recordings_measured":23,"channel_count_min":63,"channel_count_max":64,"sampling_frequency":1000,"power_line_frequency":null,"eeg_reference":null,"placement_scheme":"based on the extended 10/20 system","sweep_stamps":"{\"enrichment_updated_at\":\"2026-08-19 02:17:54\",\"metadata_updated_at\":\"2026-08-19 02:18:03\",\"archive_checked_at\":\"2026-06-26 00:23:37\",\"zarr_checked_at\":null,\"records_checked_at\":\"2026-06-26 00:10:22\",\"citations_updated_at\":\"2026-09-08 03:00:51\",\"channel_montage_checked_at\":\"2026-06-28 23:36:04\",\"hed_checked_at\":\"2026-06-30 05:09:13\",\"data_checked_at\":\"2026-08-17 03:00:57\",\"availability_report_at\":\"2026-07-23 01:21:57\",\"recording_stats_at\":\"2026-09-02 11:33:03\",\"signal_defaults_at\":\"2026-09-02 12:22:56\"}","participants":11,"num_citations":4,"latest_version":"v1.0.0","zarr_verify_status":null,"zarr_verified_at":null,"owner_username":"nemarAdmin","owner_github":"nemarAdmin","file_size_formatted":"22.00 GB","zarr_data_failures":null,"zarr_index_url":"https://zarr.nemar.org/on004951/zarr/index.json","attestation_deposit_type":null,"attestation_key_status":null,"attestation_deidentified":null,"attestation_no_duplicate":null,"attestation_upstream_source":null,"attestation_accepted_at":null}}