{"dataset":{"id":"61213","dataset_id":"on007081","name":"Passive but accessible:  Studied information is not actively stored in working memory, yet attended regardless of anticipated load","description":"This dataset comprises EEG recordings from a working memory experiment investigating whether previously studied (learned) information is actively maintained in working memory or remains passively accessible. Participants performed a visual working memory task involving memorization and probing of colored objects under varying expectations of memory load (extra-load vs low-load), while EEG was recorded to assess neural indices of active storage and attentional allocation. The study addresses how anticipated memory load influences the encoding and retrieval of studied versus novel information.","owner_user_id":15,"status":"active","github_repo":"nemarDatasets/on007081","concept_doi":"10.82901/nemar.on007081","latest_version_doi":"10.82901/nemar.on007081.v1.0.0","created_at":"2026-06-29 22:31:38","updated_at":"2026-08-19 00:06:51","zenodo_concept_id":null,"is_sandbox":0,"visibility":"public","ezid_status":"public","enrichment_json":"{\n  \"version\": \"2.0\",\n  \"pipeline_stage\": \"validated\",\n  \"title\": \"Passive but accessible:  Studied information is not actively stored in working memory, yet attended regardless of anticipated load\",\n  \"description\": \"This dataset comprises EEG recordings from a working memory experiment investigating whether previously studied (learned) information is actively maintained in working memory or remains passively accessible. Participants performed a visual working memory task involving memorization and probing of colored objects under varying expectations of memory load (extra-load vs low-load), while EEG was recorded to assess neural indices of active storage and attentional allocation. The study addresses how anticipated memory load influences the encoding and retrieval of studied versus novel information.\",\n  \"methods_description\": \"Each trial began with a fixation dot for a jittered ITI (600-1000 ms), followed by a first memory screen (1000 ms) showing lateral objects to be memorized (studied or novel), balanced by objects on the opposite side. After a 1400 ms interstimulus interval, a second memory screen (1000 ms) presented additional novel items above and below fixation, with probability of appearance manipulated between extra-load (80% present) and low-load (20% present) conditions. After a 400 ms interval, a probe appeared and participants reported the object's color via continuous mouse movement along a randomly rotated color wheel. Feedback on angular error was given for 400 ms, with corrective color feedback (1000 ms) for studied objects with errors greater than 40°.\",\n  \"license\": \"CC0\",\n  \"dataset_type\": \"raw\",\n  \"authors\": {\n    \"Yakup Yılmaz\": {},\n    \"Nursena Ataseven Özdemir\": {},\n    \"Wouter Kruijne\": {},\n    \"Elkan Akyürek\": {},\n    \"Eren Günseli\": {}\n  },\n  \"keywords\": [\n    {\n      \"term\": \"EEG\"\n    },\n    {\n      \"term\": \"working memory\"\n    },\n    {\n      \"term\": \"Attention\",\n      \"subject_scheme\": \"MeSH\",\n      \"value_uri\": \"http://id.nlm.nih.gov/mesh/D001288\"\n    },\n    {\n      \"term\": \"visual memory\"\n    },\n    {\n      \"term\": \"cognitive load\"\n    },\n    {\n      \"term\": \"color perception\"\n    }\n  ],\n  \"related_identifiers\": [\n    {\n      \"identifier\": \"https://github.com/nemarDatasets/on007081\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"https://nemar.org/dataset/on007081\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"10.18112/openneuro.ds007081.v1.0.0\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDerivedFrom\"\n    }\n  ],\n  \"resource_type_specific\": \"EEG Dataset\",\n  \"modalities\": [\n    \"eeg\"\n  ],\n  \"sizes\": [\n    \"12.1 GB (83 files)\"\n  ],\n  \"formats\": [\n    \".fdt\",\n    \".json\",\n    \".md\",\n    \".set\",\n    \".tsv\",\n    \".yml\"\n  ],\n  \"source_hash\": \"0cdd2ae1c71a85e49186f200644df7da25bf8df27a732dc1b20fb0ab1663165a\"\n}","last_activity_at":"2026-06-29 22:31:38","source":"openneuro","source_id":"ds007081","subject_count":41,"modalities":"eeg","age_min":null,"age_max":null,"file_size":12129536727,"total_files":172,"tasks":"PassiveAccessible","metadata_columns_error":null,"staleness_warn_stage":null,"staleness_admin_notified_at":null,"authors":"Yakup Yılmaz, Nursena Ataseven Özdemir, Wouter Kruijne, Elkan Akyürek, Eren Günseli","license":"CC0","readme":"[![DOI](https://img.shields.io/badge/DOI-10.82901%2Fnemar.on007081-blue)](https://doi.org/10.82901/nemar.on007081)\n\nEach trial began with a fixation dot presented for a jittered intertrial interval (ITI) between 600 and 1000 ms.\nThe first memory screen (1000 ms) showed two objects on one lateral side that participants were instructed to memorize (indicated by a wedge cue), and two objects on the opposite side to balance visual input.\nDepending on the block condition, the to-be-memorized objects on the first screen could be studied (learned in the learning phase) or novel/unstudied.\nAfter a 1400 ms interstimulus interval, a second memory screen (1000 ms) presented additional items vertically around fixation (one above and one below fixation); these items were always novel/unstudied and were placed near fixation to avoid influencing lateral EEG indices from the first screen.\nIn the extra-load expectation condition, additional second-screen items appeared on 80% of trials (and were omitted on 20% of trials), whereas in the low-load expectation condition this probability was reversed (20% appear, 80% omitted).\nAfter a 400 ms interstimulus interval, a probe from either the first or second memory screen was presented and participants reported the probed object's color by moving the mouse; the probe color updated continuously along an invisible color wheel whose orientation was randomly rotated on each trial.\nAfter the response, absolute angular error feedback was displayed for 400 ms; for studied objects, if the error exceeded 40°, the correct color was displayed for 1000 ms as corrective feedback.","bids_version":"1.10.1","sessions_count":null,"publish_date":null,"embedding_dirty":0,"license_tier":"public","zarr_status":"ready","zarr_converted_at":"2026-08-23 14:49:34","zarr_store_count":41,"zarr_index_etag":"de10da5c850574034568018cc56c8539","zarr_source_commit":"ca8538a8a0dfe42c4880332eb0ca855515a3e99c","archive_status":"ready","archive_size":10560201697,"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":0,"hed_version":"8.1.0","is_exemplar":0,"bytes_present":12129473876,"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":94748.79999999999,"recording_duration_min":2151.8,"recording_duration_max":2320,"recording_count":41,"recordings_unavailable":0,"recordings_measured":41,"channel_count_min":32,"channel_count_max":32,"sampling_frequency":1000,"power_line_frequency":50,"eeg_reference":"Average of left and right mastoids (TP9/TP10); 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