{"success":true,"database":"eegdash","data":{"_id":"6953f4249276ef1ee07a33e4","dataset_id":"ds005411","associated_paper_doi":null,"authors":["Haydn G. Herrema","Michael J. Kahana"],"bids_version":"1.7.0","contact_info":["Haydn Herrema"],"contributing_labs":null,"data_processed":false,"dataset_doi":"doi:10.18112/openneuro.ds005411.v1.0.0","datatypes":["ieeg"],"demographics":{"subjects_count":47,"ages":[25,32,46,40,29,24,32,31,34,39,38,43,31,24,30,31,43,37,38,35,55,31,20,23,52,57,39,37,35,36,34,49,55,40,36,42,62,24,62,40,23,43,30,56,45,34,22],"age_min":20,"age_max":62,"age_mean":37.53191489361702,"species":null,"sex_distribution":{"f":26,"m":22},"handedness_distribution":{"r":41,"l":4}},"experimental_modalities":null,"external_links":{"source_url":"https://openneuro.org/datasets/ds005411","osf_url":null,"github_url":null,"paper_url":null},"funding":[],"ingestion_fingerprint":"4f6d6e1b4e10b7c835eb9086dfb73a1f6287b11c42c609d29e8f269571e6ef1a","license":"CC0","n_contributing_labs":null,"name":"Free Recall of Word Lists with Repeated Items","readme":"### Free Recall of Word Lists with Repeated Items\n#### Description\nThis dataset contains behavioral events and intracranial electrophysiological recordings from a repated item free recall task.  The experiment consists of participants studying a list of words, presented visually one at a time, and then freely recalling the words from the just-presented list in any order. On each list, there is a 7-second delay period between the encoding and recall phases.  The data were collected at clinical sites across the country as part of a collaboration with the Computational Memory Lab at the University of Pennsylvania.\nThe main manipulation in this paradigm is the repetition of items in the studied list. In total, each list contains 27 encoding events, but only 12 unique words: 3 are presented one time, 3 are presented two times, and 6 are presented three times.\n#### To Note\n* The duration of the encoding events (i.e., length of word presentation) varies among sessions.  For some sessions, the words remained on screen from 750 ms, while in other sessions presentation lasted for 1600 ms. The `duration` column of the events tsv files contains this information.\n* The iEEG recordings are labeled either \"monopolar\" or \"bipolar.\"  The monopolar recordings are referenced (typically a mastoid reference), but should always be re-referenced before analysis.  The bipolar recordings are referenced according to a paired scheme indicated by the accompanying bipolar channels tables.\n* Each subject has a unique montage of electrode locations.  MNI and Talairach coordinates are provided when available.\n* Recordings done with the Blackrock system are in units of 250 nV, while recordings done with the Medtronic system are estimated through testing to have units of 0.1 uV.  We have completed the scaling to provide values in V.\n#### Contact\nFor questions or inquiries, please contact sas-kahana-sysadmin@sas.upenn.edu.","recording_modality":["ieeg"],"senior_author":"Michael J. Kahana","sessions":["0","1","2","3","4","5","6"],"size_bytes":168961242901,"source":"openneuro","study_design":null,"study_domain":null,"tasks":["RepFR1"],"timestamps":{"digested_at":"2026-04-22T12:27:45.219806+00:00","dataset_created_at":"2024-08-13T16:37:26.160Z","dataset_modified_at":"2024-08-14T14:45:19.000Z"},"total_files":193,"storage":{"backend":"s3","base":"s3://openneuro.org/ds005411","raw_key":"dataset_description.json","dep_keys":["CHANGES","README","participants.json","participants.tsv"]},"tagger_meta":{"config_hash":"4a051be509a0e3d0","metadata_hash":"8b1f8d6aaf38dedc","model":"openai/gpt-5.2","tagged_at":"2026-01-20T17:53:51.081756+00:00"},"tags":{"pathology":["Epilepsy"],"modality":["Visual"],"type":["Memory"],"confidence":{"pathology":0.6,"modality":0.85,"type":0.85},"reasoning":{"few_shot_analysis":"Closest few-shot by cognitive construct is the digit-span dataset (Healthy / Auditory / Memory), which shows the convention that explicit memory paradigms (serial recall, free recall) map to Type=Memory rather than to general attention/decision-making. For pathology conventions, the epilepsy HFO dataset demonstrates that when epilepsy is explicitly stated it should be labeled Epilepsy; in the current dataset epilepsy is not explicitly stated, so we cannot use that direct mapping as a fact. The intraoperative SEP dataset (Surgery) illustrates that hospital/surgical-context electrophysiology can map to Pathology=Surgery when the procedure context is explicit; here the context is clinical iEEG but not explicitly intraoperative.","metadata_analysis":"Key task and stimulus facts are explicitly described: (1) visual stimulus: \"participants studying a list of words, presented visually one at a time\". (2) memory/free recall construct: \"then freely recalling the words from the just-presented list in any order\" and the title line \"Free Recall of Word Lists with Repeated Items\". Clinical-context/iEEG facts (relevant to pathology inference but not explicit diagnosis): (3) \"intracranial electrophysiological recordings\" and \"data were collected at clinical sites across the country\" and mention of electrode montages/coordinates: \"Each subject has a unique montage of electrode locations.\"","paper_abstract_analysis":"No useful paper information.","evidence_alignment_check":"Pathology: Metadata SAYS \"intracranial electrophysiological recordings\" and \"collected at clinical sites\" but does NOT name a diagnosis (e.g., epilepsy). Few-shot pattern SUGGESTS that iEEG from clinical sites often involves epilepsy surgery monitoring (would map to Epilepsy or Surgery), but this is an inference. ALIGNMENT: partial/uncertain; no direct conflict, but insufficient explicit diagnostic fact → keep confidence moderate.\nModality: Metadata SAYS \"words, presented visually one at a time\". Few-shot pattern SUGGESTS visual presentation → Modality=Visual. ALIGNMENT: aligned.\nType: Metadata SAYS \"free recall\" / \"freely recalling the words\" from studied lists. Few-shot pattern SUGGESTS explicit memory tasks map to Type=Memory. ALIGNMENT: aligned.","decision_summary":"Top-2 Pathology candidates: (1) Epilepsy — supported indirectly by \"intracranial electrophysiological recordings\" + \"clinical sites\" (typical source of iEEG research cohorts), but not explicitly stated; (2) Surgery — also plausible given implanted electrodes/clinical context, but no explicit intraoperative/surgical-procedure description. Winner: Epilepsy (as the most likely recruitment diagnosis for clinical iEEG), with moderate confidence due to lack of explicit diagnosis.\nTop-2 Modality candidates: (1) Visual — supported by \"presented visually one at a time\" and visual word study; (2) Other — only if presentation modality were mixed/unspecified (not the case). Winner: Visual.\nTop-2 Type candidates: (1) Memory — supported by \"Free Recall\" and \"freely recalling the words\" after encoding/delay; (2) Learning — repetition manipulation could be framed as learning, but primary paradigm is episodic free recall. Winner: Memory."}},"nemar_citation_count":0,"computed_title":"Free Recall of Word Lists with Repeated Items","nchans_counts":[{"val":120,"count":12},{"val":118,"count":10},{"val":109,"count":9},{"val":168,"count":7},{"val":153,"count":7},{"val":122,"count":6},{"val":110,"count":6},{"val":116,"count":6},{"val":126,"count":6},{"val":182,"count":5},{"val":106,"count":5},{"val":155,"count":4},{"val":192,"count":4},{"val":200,"count":4},{"val":167,"count":4},{"val":169,"count":4},{"val":134,"count":4},{"val":211,"count":4},{"val":108,"count":4},{"val":152,"count":4},{"val":115,"count":4},{"val":105,"count":3},{"val":121,"count":3},{"val":141,"count":3},{"val":127,"count":3},{"val":132,"count":3},{"val":133,"count":3},{"val":94,"count":2},{"val":44,"count":2},{"val":187,"count":2},{"val":140,"count":2},{"val":96,"count":2},{"val":84,"count":2},{"val":160,"count":2},{"val":184,"count":2},{"val":181,"count":2},{"val":213,"count":2},{"val":99,"count":2},{"val":195,"count":2},{"val":166,"count":2},{"val":186,"count":2},{"val":55,"count":2},{"val":173,"count":2},{"val":230,"count":1},{"val":98,"count":1},{"val":165,"count":1},{"val":232,"count":1},{"val":119,"count":1},{"val":111,"count":1},{"val":123,"count":1},{"val":101,"count":1},{"val":129,"count":1},{"val":176,"count":1},{"val":215,"count":1},{"val":236,"count":1},{"val":218,"count":1},{"val":159,"count":1},{"val":104,"count":1},{"val":128,"count":1},{"val":202,"count":1},{"val":154,"count":1},{"val":142,"count":1},{"val":239,"count":1},{"val":107,"count":1},{"val":210,"count":1},{"val":158,"count":1},{"val":138,"count":1}],"sfreq_counts":[{"val":1000.0,"count":150},{"val":2048.0,"count":21},{"val":2000.0,"count":10},{"val":512.0,"count":8},{"val":1024.0,"count":4}],"stats_computed_at":"2026-04-22T23:16:00.309542+00:00","total_duration_s":504085.0625,"author_year":"Herrema2024_Free","canonical_name":null}}