{"success":true,"database":"eegdash","data":{"_id":"6953f4249276ef1ee07a33bd","dataset_id":"ds005169","associated_paper_doi":null,"authors":["Andrei Barborica","Felicia Mihai","Laurentiu Tofan","Irina Oane","Ioana Mindruta"],"bids_version":"1.9.0","contact_info":["Andrei Barborica"],"contributing_labs":null,"data_processed":false,"dataset_doi":"doi:10.18112/openneuro.ds005169.v1.0.0","datatypes":["ieeg"],"demographics":{"subjects_count":20,"ages":[39,39,28,19,25,19,26,32,22,47,27,33,39,31,21,35,23,18,30,32,25,38],"age_min":18,"age_max":47,"age_mean":29.454545454545453,"species":null,"sex_distribution":{"m":16,"f":6},"handedness_distribution":null},"experimental_modalities":null,"external_links":{"source_url":"https://openneuro.org/datasets/ds005169","osf_url":null,"github_url":null,"paper_url":null},"funding":["Romanian UEFISCDI PN-III-P4-ID-PCE-2020-0935"],"ingestion_fingerprint":"198c2ba4cc37c4247dd95358623d7f2fdeb06a21aea2fa2038bb5664dba1260f","license":"CC0","n_contributing_labs":null,"name":"Dataset of intracranial EEG during cortical stimulation evoking visual effects","readme":"In this dataset we included iEEG recordings of responses to 115 intracranial high frequency stimulations evoking\nvisual hallucinations, in 22 patients undergoing stereo-EEG presurgical evaluation for drug-resistant epilepsy.\nThe dataset contains 21 seconds of iEEG data around each stimulation, 8 seconds before the start of the stimulation,\nup to 5 seconds of intracranial stimulation and 8 seconds after the end of the stimulation.\nWe have used high-frequency bipolar stimulations of different areas of the brain, using alternating polarity\nbiphasic pulses having a duration of 1 ms, at 43.2 Hz or 50 Hz, current intensity between 0.25 to 3 mA, for up to 5 s.\nAlternating polarity protocol allows disambiguating neuronal responses time-locked to the stimulation pulses\nfrom the artefactual components, according to Barborica et al., 2022 (doi: 10.1002/hbm.25749). It is therefore\npossible to identify the brain networks underlying the clinical effects, and to create symptom-related\nactivation/connectivity maps.\nThe contact pair on which stimulation is applied, the current intensity level and evoked effect are specified\nin the events tsv. The responses are classified in 14 clinical categories: elementary (unstructured\nflashes of light), plus hallucination (presence of light in different forms or colors overlaying the background vision),\nminus hallucination (negative elementary phenomena described as scotoma, quadrantanopia, hemianopia or amaurosis),\nstatic, dynamic, continuous hallucination, intermittent hallucination, peripheric, central,\nwhole visual field, color, non-color, combined visual symptoms, multimodal hallucinations.\nNot all patients in which stimulations evoked visual hallucinations met the inclusion criteria for network analysis\nthat requires running the freesurfer pipeline, for instance patients having prior resections, therefore there are subjects\nthat do not contain ieeg data. However, they were kept in order to match the number of patients in the companion manuscript.\nContact: andrei.barborica@fizica.unibuc.ro","recording_modality":["ieeg"],"senior_author":"Ioana Mindruta","sessions":["01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16"],"size_bytes":4322721427,"source":"openneuro","study_design":null,"study_domain":null,"tasks":["dcs"],"timestamps":{"digested_at":"2026-04-22T12:27:24.696995+00:00","dataset_created_at":"2024-05-22T09:00:55.253Z","dataset_modified_at":"2024-05-22T10:58:35.000Z"},"total_files":112,"storage":{"backend":"s3","base":"s3://openneuro.org/ds005169","raw_key":"dataset_description.json","dep_keys":["CHANGES","README","participants.json","participants.tsv"]},"tagger_meta":{"config_hash":"4a051be509a0e3d0","metadata_hash":"6960ded00e00a4eb","model":"openai/gpt-5.2","tagged_at":"2026-01-20T17:41:41.732730+00:00"},"tags":{"pathology":["Epilepsy"],"modality":["Other"],"type":["Clinical/Intervention"],"confidence":{"pathology":0.85,"modality":0.7,"type":0.8},"reasoning":{"few_shot_analysis":"Most similar few-shot examples by population/clinical context are: (1) the pediatric epilepsy EEG dataset labeled Pathology=Epilepsy and Type=Clinical/Intervention, which shows the convention that when participants are explicitly epilepsy patients recruited for a clinical neuroscience aim, Pathology should be Epilepsy and Type often maps to Clinical/Intervention. (2) the intraoperative SEP dataset labeled Pathology=Surgery and Modality=Other, showing the convention that when the primary input is electrical stimulation/clinical procedure rather than an external sensory stimulus (visual/auditory/tactile), Modality is assigned as Other. This dataset is also stimulation-based (intracranial), so that convention guides Modality and Type selection.","metadata_analysis":"Key recruitment/pathology facts: \"22 patients undergoing stereo-EEG presurgical evaluation for drug-resistant epilepsy.\" This explicitly defines the clinical population as epilepsy patients. \nKey paradigm facts: \"iEEG recordings of responses to 115 intracranial high frequency stimulations evoking visual hallucinations\" and \"We have used high-frequency bipolar stimulations of different areas of the brain\"—the main 'stimulus' is intracranial electrical stimulation rather than external sensory presentation. \nClinical-mapping/intervention framing: \"possible to identify the brain networks underlying the clinical effects, and to create symptom-related activation/connectivity maps.\"","paper_abstract_analysis":"No useful paper information.","evidence_alignment_check":"Pathology: Metadata says epilepsy patients (\"presurgical evaluation for drug-resistant epilepsy\"). Few-shot pattern suggests the same mapping when epilepsy is explicit (epilepsy example). ALIGN.\nModality: Metadata says intracranial electrical stimulation (\"intracranial high frequency stimulations\"; \"high-frequency bipolar stimulations\"), with outcomes in the visual domain (\"evoking visual hallucinations\"). Few-shot pattern suggests that stimulation/procedure-driven datasets map to Modality=Other rather than Visual (surgery/SEP example). PARTIAL TENSION (visual phenomenon vs electrical input), but metadata indicates input is electrical, so Modality=Other wins.\nType: Metadata emphasizes presurgical evaluation and symptom-network mapping (\"presurgical evaluation\"; \"create symptom-related activation/connectivity maps\"). Few-shot pattern suggests clinical cohorts with intervention/procedure paradigms map to Type=Clinical/Intervention (epilepsy HFO; surgery SEP). ALIGN.","decision_summary":"Pathology top-2: (1) Epilepsy — supported by \"presurgical evaluation for drug-resistant epilepsy\" and stereo-EEG context; (2) Other — could be considered if focusing on hallucinations broadly, but epilepsy is explicit. Final: Epilepsy. Confidence supported by explicit recruitment statement.\nModality top-2: (1) Other — supported by \"intracranial high frequency stimulations\" and \"high-frequency bipolar stimulations\" indicating electrical stimulation as the primary input; (2) Visual — because effects are \"visual hallucinations\" and categories include visual-field descriptors. Head-to-head: modality is defined by stimulus/input channel; here the input is intracranial stimulation, not visual presentation. Final: Other. Confidence moderate due to visual-domain outcomes but non-visual input.\nType top-2: (1) Clinical/Intervention — supported by \"presurgical evaluation\" and stimulation mapping \"clinical effects\" / \"activation/connectivity maps\"; (2) Perception — because the evoked phenomena are visual percepts/hallucinations. Head-to-head: the dataset purpose is clinical functional mapping via stimulation in epilepsy patients, so Clinical/Intervention is stronger. Final: Clinical/Intervention."}},"nemar_citation_count":0,"computed_title":"Dataset of intracranial EEG during cortical stimulation evoking visual effects","nchans_counts":[{"val":82,"count":19},{"val":94,"count":9},{"val":101,"count":6},{"val":95,"count":5},{"val":193,"count":5},{"val":136,"count":5},{"val":102,"count":5},{"val":70,"count":4},{"val":40,"count":4},{"val":83,"count":3},{"val":85,"count":3},{"val":84,"count":3},{"val":184,"count":3},{"val":79,"count":3},{"val":104,"count":2},{"val":91,"count":2},{"val":106,"count":2},{"val":58,"count":2},{"val":143,"count":2},{"val":103,"count":1},{"val":186,"count":1},{"val":29,"count":1},{"val":80,"count":1},{"val":89,"count":1},{"val":96,"count":1},{"val":160,"count":1},{"val":76,"count":1},{"val":81,"count":1},{"val":188,"count":1},{"val":144,"count":1},{"val":71,"count":1},{"val":69,"count":1},{"val":100,"count":1},{"val":109,"count":1},{"val":105,"count":1},{"val":39,"count":1},{"val":113,"count":1},{"val":114,"count":1},{"val":88,"count":1},{"val":98,"count":1},{"val":92,"count":1},{"val":38,"count":1},{"val":99,"count":1},{"val":86,"count":1}],"sfreq_counts":[{"val":4096.0,"count":112}],"stats_computed_at":"2026-04-22T23:16:00.309039+00:00","total_duration_s":2352.0,"author_year":"Barborica2024","canonical_name":null}}