{"dataset":{"id":"489","dataset_id":"on003190","name":"Assesment of the visual stimuli properties in P300 paradigm","description":"This dataset comprises 382 electroencephalographic recordings from 19 participants performing a P300 visual oddball paradigm with systematically varied stimulus properties. Participants completed three experimental sessions, each containing seven recordings with different numbers of visual stimuli (4-9) and flash types (standard flash or cartoon face overlay). EEG data were acquired from eight scalp electrodes at 256 Hz sampling rate, with detailed event markers encoding experimental phases and stimulus presentations.","owner_user_id":2,"status":"active","github_repo":"nemarDatasets/on003190","concept_doi":"10.82901/nemar.on003190","latest_version_doi":"10.82901/nemar.on003190.v1.0.0","created_at":"2026-05-13 12:08:35","updated_at":"2026-07-22 22:37:33","zenodo_concept_id":null,"is_sandbox":0,"visibility":"public","ezid_status":"public","enrichment_json":"{\n  \"version\": \"2.0\",\n  \"pipeline_stage\": \"validated\",\n  \"title\": \"Assesment of the visual stimuli properties in P300 paradigm\",\n  \"license\": \"CC0\",\n  \"dataset_type\": \"raw\",\n  \"authors\": {\n    \"Omar Mendoza-Montoya\": {},\n    \"Javier M. Antelis\": {}\n  },\n  \"related_identifiers\": [\n    {\n      \"identifier\": \"10.18112/openneuro.ds003190.v1.0.1\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDerivedFrom\"\n    },\n    {\n      \"identifier\": \"https://github.com/nemarDatasets/on003190\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"https://nemar.org/dataset/on003190\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    }\n  ],\n  \"modalities\": [\n    \"eeg\"\n  ],\n  \"resource_type_specific\": \"EEG Dataset\",\n  \"sizes\": [\n    \"1.3 GB (1153 files)\"\n  ],\n  \"formats\": [\n    \".eeg\",\n    \".gitattributes\",\n    \".json\",\n    \".md\",\n    \".tsv\",\n    \".vhdr\",\n    \".vmrk\",\n    \".yml\"\n  ],\n  \"description\": \"This dataset comprises 382 electroencephalographic recordings from 19 participants performing a P300 visual oddball paradigm with systematically varied stimulus properties. Participants completed three experimental sessions, each containing seven recordings with different numbers of visual stimuli (4-9) and flash types (standard flash or cartoon face overlay). EEG data were acquired from eight scalp electrodes at 256 Hz sampling rate, with detailed event markers encoding experimental phases and stimulus presentations.\",\n  \"methods_description\": \"EEG recordings were collected from 8 channels (Fz, Cz, P3, Pz, P4, PO7, PO8, Oz) according to the 10-20 electrode placement standard, grounded to AFz and referenced to right mastoid (M2). Sampling frequency was 256 Hz. Participants performed 3 sessions with 7 recordings each, varying stimulus count (4-9) and flash type (standard flash or superimposed cartoon face). Event markers encoded experimental phases (Fixation, Target Presentation, Preparation, Stimulation, Rest) and stimulus identity.\",\n  \"keywords\": [\n    {\n      \"term\": \"EEG\"\n    },\n    {\n      \"term\": \"P300\"\n    },\n    {\n      \"term\": \"visual evoked potentials\"\n    },\n    {\n      \"term\": \"oddball paradigm\"\n    },\n    {\n      \"term\": \"event-related potentials\"\n    },\n    {\n      \"term\": \"visual stimuli\"\n    }\n  ],\n  \"source_hash\": \"940803ca5b414007de6e5ec5701da4b3ed9c26ce8428a006a92887a40594ebfe\"\n}","last_activity_at":"2026-05-13 12:08:35","source":"openneuro","source_id":"ds003190","subject_count":19,"modalities":"eeg","age_min":null,"age_max":null,"file_size":1361817402,"total_files":2368,"tasks":"cnos,ctos","metadata_columns_error":null,"staleness_warn_stage":null,"staleness_admin_notified_at":null,"authors":"Omar Mendoza-Montoya, Javier M. Antelis","license":"CC0","readme":"[![DOI](https://img.shields.io/badge/DOI-10.82901%2Fnemar.on003190-blue)](https://doi.org/10.82901/nemar.on003190)\n\nDataset description:\r\n\r\nThe database consists of a total of 382 electroencephalographic files from 19 participants. All recordings were collected on channels Fz, Cz, P3, Pz,P4, PO7, PO8 and Oz, according to the 10-20 EEG electrode placement standard, grounded to AFz channel and referenced to right mastoid (M2).\r\n•Each participant (S1-S19) performed 3 experimental sessions (Session01-Session03) and in each session there are 7 data files.\r\n•The filenames for these data files are ’Training 4’, ’Training 5 - SF’, ’Training 5 - CF’, ’Training 6’, ’Training 7’, ’Training 8’, and ’Training 9’.\r\n•The number accompanying the filename indicates the number of stimuli, whereas letters SF and CF for data files with 5 stimuli indicate the type of flash, SF for Standard-Flash of the stimulus and CF for superimposing a yellow smiling Cartoon Face.\r\n•Note that filenames for data-files with 4, 6, 7, 8, and 9 stimuli do not have a letter and were recorded with the type of flash that provided the greater classification accuracy when using 5 stimuli.\r\n•Each data file contains the data stream in a 2D matrix where rows correspond to channels and columns correspond to time samples with sampling frequency of 256Hz.\r\n•There are 10 rows, 1 to 8 for each EEG electrode (in descending order Fz, Cz, P3, Pz, P4, PO7, PO8 and Oz), 9 for time stamps, and 10 for a marker that encode information about the execution of theexperiment.\r\n\r\nThe marker encodes this information as follows:\r\n•(i)marker numbers 101, 200, 201, 202 and 203, indicate the beginning and end of the five phases in a block\r\n•(ii)marker numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9, indicate the symbol that is activated on the screen\r\n•(iii)each phase of the experiment block is identified with a marker\r\n•(iv)the phases of one block of the experiment are: Fixation, Target Presentation, Preparation, Stimulation and Rest\r\n•(iv)in particular the Stimulation phase has a start marker and an end marker","bids_version":"1.2","sessions_count":3,"publish_date":"2026-05-13 12:08:35","embedding_dirty":0,"license_tier":"public","zarr_status":"ready","zarr_converted_at":"2026-09-03 12:14:17","zarr_store_count":384,"zarr_index_etag":"fffb88881a853ca1d0a11cb90ccfffcb","zarr_source_commit":"3be7bd7dda0ca4cbb1f3cecec5765da40b93adfd","archive_status":"ready","archive_size":1153748319,"archive_retry_count":0,"records_status":null,"archive_skip_reason":null,"zarr_errors":0,"zarr_failure_count":0,"zarr_deterministic":0,"zarr_failed_at":null,"num_dataset_citations":3,"num_datapaper_citations":0,"n_channels":9,"electrode_system":"10-10","has_hed":0,"hed_version":null,"is_exemplar":0,"bytes_present":1335943827,"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":143089.4120000003,"recording_duration_min":244.936,"recording_duration_max":525.532,"recording_count":384,"recordings_unavailable":0,"recordings_measured":384,"channel_count_min":9,"channel_count_max":10,"sampling_frequency":256,"power_line_frequency":60,"eeg_reference":"M2","placement_scheme":null,"sweep_stamps":"{\"enrichment_updated_at\":\"2026-07-22 22:37:23\",\"metadata_updated_at\":\"2026-07-22 22:37:32\",\"archive_checked_at\":\"2026-06-05 01:33:24\",\"zarr_checked_at\":\"2026-06-07 17:58:42\",\"records_checked_at\":null,\"citations_updated_at\":\"2026-09-08 03:00:51\",\"channel_montage_checked_at\":\"2026-06-28 23:09:49\",\"hed_checked_at\":\"2026-06-30 04:41:10\",\"data_checked_at\":\"2026-07-22 22:47:21\",\"availability_report_at\":\"2026-07-23 01:13:20\",\"signal_defaults_at\":\"2026-09-02 11:58:01\",\"recording_stats_at\":\"2026-09-04 03:00:27\"}","participants":19,"num_citations":3,"latest_version":"v1.0.0","zarr_verify_status":null,"zarr_verified_at":null,"owner_username":"yahya","owner_github":"neuromechanist","file_size_formatted":"1.27 GB","zarr_data_failures":null,"zarr_index_url":"https://zarr.nemar.org/on003190/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}}