{"dataset":{"id":"51211","dataset_id":"on002691","name":"Internal attention study","description":"This dataset comprises EEG recordings from 20 subjects performing a sustained attention task involving mental concentration on a target stimulus. Participants received automated verbal instructions guiding them through cycles of relaxation, preparation, and 15-second concentration periods, with the entire experiment conducted with eyes closed. The dataset includes 20 repetitions of the attention task per participant and is annotated using HED (Hierarchical Event Descriptors) version 8.0.0.","owner_user_id":15,"status":"active","github_repo":"nemarDatasets/on002691","concept_doi":"10.82901/nemar.on002691","latest_version_doi":"10.82901/nemar.on002691.v1.0.0","created_at":"2026-06-21 06:01:02","updated_at":"2026-07-10 22:10:39","zenodo_concept_id":null,"is_sandbox":0,"visibility":"public","ezid_status":"public","enrichment_json":"{\n  \"version\": \"2.0\",\n  \"pipeline_stage\": \"validated\",\n  \"title\": \"Internal attention study\",\n  \"description\": \"This dataset comprises EEG recordings from 20 subjects performing a sustained attention task involving mental concentration on a target stimulus. Participants received automated verbal instructions guiding them through cycles of relaxation, preparation, and 15-second concentration periods, with the entire experiment conducted with eyes closed. The dataset includes 20 repetitions of the attention task per participant and is annotated using HED (Hierarchical Event Descriptors) version 8.0.0.\",\n  \"methods_description\": \"EEG data were collected from 20 subjects during a mental concentration task. Subjects received four types of automated verbal instructions via speakerphone: wait, relax, get ready, and concentrate. Each trial cycle consisted of approximately 9 seconds of relaxation, 6 seconds of preparation, and 15 seconds of mental concentration on a target, repeated 20 times per participant with eyes closed throughout.\",\n  \"license\": \"CC0\",\n  \"dataset_type\": \"raw\",\n  \"authors\": {\n    \"Arnaud Delorme\": {},\n    \"Dean Radin\": {}\n  },\n  \"keywords\": [\n    {\n      \"term\": \"EEG\"\n    },\n    {\n      \"term\": \"Attention\",\n      \"subject_scheme\": \"MeSH\",\n      \"value_uri\": \"http://id.nlm.nih.gov/mesh/D001288\"\n    },\n    {\n      \"term\": \"mental concentration\"\n    },\n    {\n      \"term\": \"psychophysics\"\n    },\n    {\n      \"term\": \"cognitive task\"\n    }\n  ],\n  \"related_identifiers\": [\n    {\n      \"identifier\": \"https://github.com/nemarDatasets/on002691\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"https://nemar.org/dataexplorer/detail?dataset_id=on002691\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"10.1016/j.quantum.2015.12.012\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsReferencedBy\"\n    },\n    {\n      \"identifier\": \"10.18112/openneuro.ds002691.v1.1.0\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDerivedFrom\"\n    },\n    {\n      \"identifier\": \"10.82901/nemar.on002691\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDescribedBy\"\n    }\n  ],\n  \"resource_type_specific\": \"EEG Dataset\",\n  \"modalities\": [\n    \"eeg\"\n  ],\n  \"sizes\": [\n    \"813.3 MB (22 files)\"\n  ],\n  \"formats\": [\n    \".gitattributes\",\n    \".json\",\n    \".m\",\n    \".md\",\n    \".set\",\n    \".tsv\",\n    \".yml\"\n  ],\n  \"source_hash\": \"a9cb37a91297b9bf698932a75f98c1284a723d4c6eb8c9bed0fcb6e29eb5fa5f\"\n}","last_activity_at":"2026-06-21 06:01:02","source":"openneuro","source_id":"ds002691","subject_count":20,"modalities":"eeg","age_min":23,"age_max":66,"file_size":814493931,"total_files":152,"tasks":"internalattention","metadata_columns_error":null,"staleness_warn_stage":null,"staleness_admin_notified_at":null,"authors":"Arnaud Delorme, Dean Radin","license":"CC0","readme":"[![DOI](https://img.shields.io/badge/DOI-10.82901%2Fnemar.on002691-blue)](https://doi.org/10.82901/nemar.on002691)\n\nThis experiment has 20 subjects. Subjects asked to mentally concentrate on\na target (see published article for more information) for periods of about \n15 seconds.\n \nThere are 4 verbal instructions given to subject by an automated computer\nprogram connected to a speakerphone:\n- The instruction is to wait until the experiment starts\n- The instruction is to relax\n- The instruction is to get ready as the trial is about to start\n- The instruction is to mentally concentrate on the target\n \nAll the experiment is performed eye's closed. Relax periods last for about\n9 seconds, are then followed by a period of 6 seconds where the participants\nis asked to \"get ready\" for the trial, followed by a period of 15 seconds of\nconcentration. This sequence is repeated 20 times for each participant.","bids_version":"v1.2.1","sessions_count":null,"publish_date":null,"embedding_dirty":0,"license_tier":"public","zarr_status":"ready","zarr_converted_at":"2026-09-06 14:05:23","zarr_store_count":20,"zarr_index_etag":"7f4dde1b92a564282e96cd2b33aa555f","zarr_source_commit":"241d0c476c6e012b34d51dca18101dad28eada42","archive_status":"ready","archive_size":698345025,"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":0,"num_datapaper_citations":0,"n_channels":32,"electrode_system":"egi-geodesic","has_hed":1,"hed_version":"8.0.0","is_exemplar":0,"bytes_present":813264894,"data_complete":1,"withdrawn_at":null,"withdrawn_reason":null,"archive_complete":null,"archive_absent_files":null,"archive_declared_files":null,"zarr_pool_breaks":0,"total_recording_duration":24196.004000000004,"recording_duration_min":729.324,"recording_duration_max":1544.648,"recording_count":20,"recordings_unavailable":0,"recordings_measured":20,"channel_count_min":32,"channel_count_max":32,"sampling_frequency":250,"power_line_frequency":60,"eeg_reference":"common","placement_scheme":null,"sweep_stamps":"{\"enrichment_updated_at\":\"2026-06-21 06:08:06\",\"metadata_updated_at\":\"2026-06-21 06:08:07\",\"archive_checked_at\":\"2026-06-21 06:09:24\",\"zarr_checked_at\":null,\"records_checked_at\":\"2026-06-21 06:09:21\",\"citations_updated_at\":\"2026-08-17 03:01:00\",\"channel_montage_checked_at\":\"2026-06-28 23:07:33\",\"hed_checked_at\":\"2026-06-30 04:38:22\",\"data_checked_at\":\"2026-07-28 03:00:46\",\"availability_report_at\":\"2026-07-23 01:12:10\",\"signal_defaults_at\":\"2026-09-02 11:55:51\",\"recording_stats_at\":\"2026-09-07 03:00:56\"}","participants":20,"num_citations":0,"latest_version":"v1.0.0","zarr_verify_status":null,"zarr_verified_at":null,"owner_username":"nemarAdmin","owner_github":"nemarAdmin","file_size_formatted":"777 MB","zarr_data_failures":null,"zarr_index_url":"https://zarr.nemar.org/on002691/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}}