{"success":true,"database":"eegdash","data":{"_id":"6953f4249276ef1ee07a33ec","dataset_id":"ds005489","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.ds005489.v1.0.3","datatypes":["ieeg"],"demographics":{"subjects_count":37,"ages":[48,49,39,20,31,47,48,24,32,36,24,48,27,23,40,31,45,49,28,21,20,19,39,34,36,26,40,24,47,30,26,20,29,47,49,41,23,42],"age_min":19,"age_max":49,"age_mean":34.26315789473684,"species":null,"sex_distribution":{"f":23,"m":15},"handedness_distribution":{"r":28,"a":3,"l":7}},"experimental_modalities":null,"external_links":{"source_url":"https://openneuro.org/datasets/ds005489","osf_url":null,"github_url":null,"paper_url":null},"funding":["DARPA RAM: N66001-14-2-4032"],"ingestion_fingerprint":"b258fc687357cf711579cad40c1cd5ab625584842845cc44323dfde0db5384b7","license":"CC0","n_contributing_labs":null,"name":"Free Recall with Open-Loop Stimulation at Encoding","readme":"### Free Recall with Open-Loop Stimulation at Encoding\n#### Description\nThis dataset contains behavioral events and intracranial electrophysiological recordings from a delayed free recall task with open-loop stimulation at encoding.  The experiment consists of participants studying a list of words, presented visually one at a time, completing simple arithmetic problems that function as a distractor, and then freely recalling the words from the just-presented list in any order.  The data was collected at clinical sites across the country as part of a collaboration with the Computational Memory Lab at the University of Pennsylvania.  This dataset is an open-loop stimulation version of the [FR1](https://openneuro.org/datasets/ds004789) dataset.\nThis study contains open-loop electrical stimulation of the brain during encoding.  There is no stimulation during the distractor or retrieval phases.  Stimulation is delivered to a single electrode at a time, with locations chosen in the hippocampus and entorhinal cortex.  Stimulation parameters are included in the behavioral events tsv files, denoting the anode/cathode labels, amplitude, pulse frequency, pulse width, and pulse count.\n20 of the 25 lists in a session are randomly assigned as stimulation lists.  On these lists, stimulation occurs on alternating two-word blocks, meaning 6 of the 12 words are presented with stimulation.  Stimulation starts 200 ms prior to the onset of the first word in the block and lasts for 4.6 seconds, ending 200-450 ms after the offset of the second word (depending on the inter-stimulus interval).  Half of the stimulation lists begin with a stimulation on pair and half begin with a stumulation off pair, but the order of these conditions is random.  A stimulation list that begins with a stimulation on pair would look as follows (with bold indicating stimulation):\n**1 - 2** | 3 - 4 | **5 - 6** | 7 - 8 | **9 - 10** | 11 - 12\n#### To Note\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":69728763972,"source":"openneuro","study_design":null,"study_domain":null,"tasks":["FR2"],"timestamps":{"digested_at":"2026-04-22T12:27:46.706283+00:00","dataset_created_at":"2024-09-15T18:28:05.055Z","dataset_modified_at":"2024-09-17T23:14:43.000Z"},"total_files":154,"storage":{"backend":"s3","base":"s3://openneuro.org/ds005489","raw_key":"dataset_description.json","dep_keys":["CHANGES","README","participants.json","participants.tsv"]},"tagger_meta":{"config_hash":"3557b68bca409f28","metadata_hash":"4367966853bfe3cd","model":"openai/gpt-5.2","tagged_at":"2026-04-07T09:32:40.872789+00:00"},"tags":{"pathology":["Unknown"],"modality":["Visual"],"type":["Memory"],"confidence":{"pathology":0.6,"modality":0.8,"type":0.9},"reasoning":{"few_shot_analysis":"Most similar few-shot example by task purpose is the digit-span dataset (few-shot: \"EEG, pupillometry... digit span task\") which is labeled Type=Memory. That example shows the convention that when the primary paradigm is explicit memory encoding/maintenance with later recall, Type should be Memory (even if additional phases like rest/control are present). For modality, few-shot conventions map the label to the stimulus channel (e.g., digit-span is Auditory because digits are presented auditorily); here the words are explicitly presented visually, so Modality should be Visual. No few-shot example directly establishes a convention for intracranial/clinical-site recruitment without an explicit diagnosis; this motivates considering Pathology=Unknown vs Epilepsy based on metadata facts vs inference limits.","metadata_analysis":"Key task facts:\n- The dataset is \"intracranial electrophysiological recordings\" during \"a delayed free recall task\" with stimulation at encoding: \"This dataset contains behavioral events and intracranial electrophysiological recordings from a delayed free recall task with open-loop stimulation at encoding.\" \n- Visual stimulus modality is explicit: participants study \"a list of words, presented visually one at a time\".\n- Memory construct is explicit via encoding + distractor + free recall: \"completing simple arithmetic problems that function as a distractor, and then freely recalling the words from the just-presented list in any order.\"\n- Intervention manipulation is also explicit: \"open-loop electrical stimulation of the brain during encoding\" and \"Stimulation is delivered to a single electrode at a time, with locations chosen in the hippocampus and entorhinal cortex.\"\nPopulation/pathology facts: participants are not described with a diagnosis; only that \"The data was collected at clinical sites across the country\" and uses intracranial recordings.","paper_abstract_analysis":"No useful paper information.","evidence_alignment_check":"Pathology:\n- Metadata says: no explicit diagnosis; only \"intracranial electrophysiological recordings\" and \"collected at clinical sites\".\n- Few-shot suggests: no direct convention for inferring pathology from intracranial recordings alone.\n- Alignment: N/A (no explicit metadata pathology to align). Because no diagnosis is stated, choose Pathology=Unknown (metadata does not support a specific pathology label).\n\nModality:\n- Metadata says: \"list of words, presented visually one at a time\".\n- Few-shot suggests: modality follows stimulus channel (e.g., digit-span labeled Auditory because auditory digits).\n- Alignment: ALIGN (visual word presentation implies Visual modality).\n\nType:\n- Metadata says: \"delayed free recall task\" with \"studying a list of words\" and later \"freely recalling the words\".\n- Few-shot suggests: explicit memory paradigms map to Type=Memory (digit-span example).\n- Alignment: ALIGN (task purpose is episodic/verbal memory encoding and recall, despite stimulation manipulation).","decision_summary":"Top-2 candidates (head-to-head) and final selections:\n\nPathology:\n1) Unknown (WINNER) — Evidence: no explicit recruitment diagnosis is provided; only indirect context: \"intracranial electrophysiological recordings\" and \"collected at clinical sites\".\n2) Epilepsy (RUNNER-UP) — Rationale: intracranial recordings at clinical sites often occur in epilepsy monitoring, but this is not explicitly stated.\nDecision: Unknown, because EEGDash rules require using explicitly stated clinical recruitment facts; here the diagnosis is not stated.\nConfidence justification: inference-only vs missing explicit diagnosis keeps confidence modest.\n\nModality:\n1) Visual (WINNER) — Evidence: \"list of words, presented visually one at a time\".\n2) Multisensory (RUNNER-UP) — Rationale: arithmetic distractor could be visual/other, but no clear non-visual stimulus channel is described.\nDecision: Visual.\nConfidence justification: one explicit quote for visual presentation plus standard modality-by-stimulus convention from few-shot.\n\nType:\n1) Memory (WINNER) — Evidence: \"delayed free recall task\", \"studying a list of words\", \"freely recalling the words\".\n2) Clinical/Intervention (RUNNER-UP) — Evidence: \"open-loop electrical stimulation of the brain during encoding\" could motivate an intervention-focused label, but the core construct is memory encoding/retrieval.\nDecision: Memory.\nConfidence justification: multiple explicit memory-task quotes plus strong few-shot analog (digit-span labeled Memory)."}},"nemar_citation_count":0,"computed_title":"Free Recall with Open-Loop Stimulation at Encoding","nchans_counts":[{"val":100,"count":12},{"val":64,"count":10},{"val":141,"count":9},{"val":118,"count":8},{"val":96,"count":8},{"val":136,"count":7},{"val":109,"count":7},{"val":68,"count":6},{"val":72,"count":6},{"val":88,"count":6},{"val":126,"count":4},{"val":56,"count":4},{"val":75,"count":4},{"val":70,"count":4},{"val":110,"count":4},{"val":87,"count":4},{"val":156,"count":3},{"val":120,"count":3},{"val":93,"count":3},{"val":76,"count":3},{"val":85,"count":3},{"val":74,"count":3},{"val":58,"count":3},{"val":128,"count":2},{"val":108,"count":2},{"val":124,"count":2},{"val":134,"count":2},{"val":138,"count":2},{"val":112,"count":2},{"val":123,"count":2},{"val":99,"count":2},{"val":104,"count":2},{"val":80,"count":2},{"val":97,"count":1},{"val":20,"count":1},{"val":14,"count":1},{"val":177,"count":1},{"val":114,"count":1},{"val":163,"count":1},{"val":18,"count":1},{"val":83,"count":1},{"val":101,"count":1},{"val":16,"count":1}],"sfreq_counts":[{"val":500.0,"count":90},{"val":1000.0,"count":46},{"val":1600.0,"count":10},{"val":513.0,"count":4},{"val":499.7071,"count":2},{"val":256.0,"count":2}],"stats_computed_at":"2026-04-22T23:16:00.309658+00:00","total_duration_s":497423.64333435526,"author_year":"Herrema2024_Free_Recall","canonical_name":null}}