{"format":"nemar-zarr-index","format_version":3,"dataset_id":"nm000122","contract_base":"https://zarr.nemar.org/nm000122/zarr/","data_base":"https://nemar.s3.us-east-2.amazonaws.com/nm000122/zarr/","data_base_kind":"s3-public","s3_uri":"s3://nemar/nm000122/zarr/","s3_region":"us-east-2","s3_anonymous":true,"source_commit":"681d0dd9af19ae6e4f37cad8a36d2df582f42677","engine_version":"3","biosigio_version":"1.2.7","updated_utc":"2026-09-04T15:27:37Z","doi":"10.82901/nemar.nm000122","license":"CC BY 4.0","citation":"Jingjing Chen, Dan Zhang, Andreas K. Engel, Qin Gong, Alexander Maye (2026) Chen2017 \u2013 Single-flicker online SSVEP BCI dataset (v1.0.2). NEMAR. https://doi.org/10.82901/nemar.nm000122","hed_version":"8.4.0","layout":{"level0":"<zarr>/<group>/0","view":"<zarr>/<group>/view/<L>","view_levels":"1..n_view_levels from the group attrs","scale_offset":"level-0 array attrs scale[] and offset[]; physical = digital * scale + offset","events":"<data_base>events.parquet"},"discovered_count":12,"store_count":12,"n_recordings":12,"errors":0,"failure_count":0,"pending_count":0,"stores":[{"path":"sub-1/ses-1/eeg/sub-1_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-1/ses-1/eeg/sub-1_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":206496,"duration_s":825.984,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-1/ses-1/eeg/sub-1_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":221,"trial_types":{"east":58,"north":50,"south":39,"west":74}},{"path":"sub-10/ses-1/eeg/sub-10_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-10/ses-1/eeg/sub-10_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":297614,"duration_s":1190.456,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-10/ses-1/eeg/sub-10_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":318,"trial_types":{"east":68,"north":79,"south":93,"west":78}},{"path":"sub-11/ses-1/eeg/sub-11_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-11/ses-1/eeg/sub-11_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":365922,"duration_s":1463.688,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-11/ses-1/eeg/sub-11_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":391,"trial_types":{"east":71,"north":103,"south":146,"west":71}},{"path":"sub-12/ses-1/eeg/sub-12_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-12/ses-1/eeg/sub-12_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":254412,"duration_s":1017.648,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-12/ses-1/eeg/sub-12_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":272,"trial_types":{"east":84,"north":66,"south":47,"west":75}},{"path":"sub-2/ses-1/eeg/sub-2_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-2/ses-1/eeg/sub-2_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":205780,"duration_s":823.12,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-2/ses-1/eeg/sub-2_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":218,"trial_types":{"east":68,"north":45,"south":37,"west":68}},{"path":"sub-3/ses-1/eeg/sub-3_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-3/ses-1/eeg/sub-3_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":216946,"duration_s":867.784,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-3/ses-1/eeg/sub-3_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":228,"trial_types":{"east":75,"north":42,"south":36,"west":75}},{"path":"sub-4/ses-1/eeg/sub-4_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-4/ses-1/eeg/sub-4_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":267671,"duration_s":1070.684,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-4/ses-1/eeg/sub-4_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":286,"trial_types":{"east":78,"north":68,"south":60,"west":80}},{"path":"sub-5/ses-1/eeg/sub-5_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-5/ses-1/eeg/sub-5_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":235724,"duration_s":942.896,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-5/ses-1/eeg/sub-5_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":252,"trial_types":{"east":77,"north":53,"south":46,"west":76}},{"path":"sub-6/ses-1/eeg/sub-6_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-6/ses-1/eeg/sub-6_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":215993,"duration_s":863.972,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-6/ses-1/eeg/sub-6_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":231,"trial_types":{"east":70,"north":48,"south":43,"west":70}},{"path":"sub-7/ses-1/eeg/sub-7_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-7/ses-1/eeg/sub-7_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":198978,"duration_s":795.912,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-7/ses-1/eeg/sub-7_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":213,"trial_types":{"east":65,"north":44,"south":39,"west":65}},{"path":"sub-8/ses-1/eeg/sub-8_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-8/ses-1/eeg/sub-8_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":246186,"duration_s":984.744,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-8/ses-1/eeg/sub-8_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":263,"trial_types":{"east":78,"north":54,"south":50,"west":81}},{"path":"sub-9/ses-1/eeg/sub-9_ses-1_task-ssvep_run-0_eeg.set","zarr":"sub-9/ses-1/eeg/sub-9_ses-1_task-ssvep_run-0_eeg.zarr","updated_utc":"2026-09-04T15:27:37Z","source_tree":"raw","derived":false,"modalities":["eeg"],"groups":[{"name":"eeg_250hz","modality":"EEG","rate":250.0,"n_channels":32,"n_samples":232042,"duration_s":928.168,"n_view_levels":5,"view_chunk_columns":1024,"source_rate_hz":512.0,"chunk_samples":1000,"shard_samples":75000}],"power_line_frequency":50.0,"units_report":{"converted":0,"relabelled":32,"kept_importer_unit":0,"units_column_present":true,"sidecar":"sub-9/ses-1/eeg/sub-9_ses-1_task-ssvep_run-0_channels.tsv","sidecar_supplied":true},"n_events":248,"trial_types":{"east":74,"north":51,"south":48,"west":75}}],"failures":[],"pending":[],"events_parquet":"https://nemar.s3.us-east-2.amazonaws.com/nm000122/zarr/events.parquet","events_row_count":3141}