{"success":true,"database":"eegdash","data":{"_id":"69a33a3b897a7725c66f3ee9","dataset_id":"ds007315","associated_paper_doi":null,"authors":["Maria Martzoukou","Nefeli K. Dimitriou","Binbin Xu","Malo Renaud-d’Ambra","Anastasia Nousia","Alexandre Aksenov","Anne Beuter","Grigorios Nasios"],"bids_version":"1.8.0","contact_info":["Maria Martzoukou"],"contributing_labs":null,"data_processed":false,"dataset_doi":"doi:10.18112/openneuro.ds007315.v1.0.1","datatypes":["eeg"],"demographics":{"subjects_count":2,"ages":[38,54],"age_min":38,"age_max":54,"age_mean":46.0,"species":null,"sex_distribution":{"f":1,"m":1},"handedness_distribution":{"r":1,"l":1}},"experimental_modalities":null,"external_links":{"source_url":"https://openneuro.org/datasets/ds007315","osf_url":null,"github_url":null,"paper_url":null},"funding":["No formal funding reported."],"ingestion_fingerprint":"a1d73638cd6ce9ee4b8e5fe5b112b478f34409b86d5ade77522092b042b832a2","license":"CC0","n_contributing_labs":null,"name":"tACS for Patients with Post-Stroke Anomia","readme":"**Title:** Transcranial Alternating Current Stimulation (tACS) for Patients with Post-Stroke Anomia: Preliminary Data on Picture Naming Performance\n**Dataset Description:**\\\nThis dataset includes EEG recordings from two post-stroke patients with chronic anomia who participated in an 8-week individualized neuromodulation intervention using transcranial alternating current stimulation (tACS). The intervention alternated between stimulation and non-stimulation phases every two weeks and was designed to enhance naming abilities via cortical entrainment, guided by individual EEG profiles.\n**Data Overview:**\n- **Participants:** 2 individuals with post-stroke anomia (1 left-hemisphere lesion, 1 right-hemisphere lesion)\n- **Sessions:** EEG recorded every two weeks during the intervention (W1, W2, W4, W6, W8), and at follow-ups (W12, W20)\n- **Stimulation:** tACS applied during alternating weeks; frequency and montage were personalized based on initial EEG\n- **Tasks:** Picture naming task using a standardized set of stimuli; EEG recorded during task execution\n- **Modality:** EEG (recorded using Starstim-32), processed in EEGLAB and prepared for BIDS\n**Experimental Design:**\\\nA single-case experimental design (SCED, ABAB type) was employed. Behavioral and EEG data were collected across 24 naming sessions and 6 EEG recording sessions per participant. The data includes tACS and no-tACS conditions.\n**Purpose:**\\\nTo investigate whether tACS improves naming accuracy and latency in chronic aphasia and whether those effects are sustained after intervention.\n**Data Notes:**\n- EEG recordings are organized in BIDS format, with sessions labeled by week (e.g., `week-01`, `week-12`)\n- Session and run numbers reflect weeks of intervention\n**Ethics:**\\\nAll participants provided written informed consent. The study was approved by the Ethics Committee of the Medical School of Ioannina (approval nr. 49625) and conducted in accordance with the Declaration of Helsinki.\n**Contact:**\\\nFor questions about the dataset, contact Maria Martzoukou (<m.martzoukou@uoi.gr>)","recording_modality":["eeg"],"senior_author":"Grigorios Nasios","sessions":["1","12","2","20","4","6","8"],"size_bytes":1165892937,"source":"openneuro","storage":{"backend":"s3","base":"s3://openneuro.org/ds007315","raw_key":"dataset_description.json","dep_keys":["CHANGES","README","datacite.yml","participants.json","participants.tsv","task-PictureNaming_events.json"]},"study_design":null,"study_domain":null,"tasks":["PictureNaming"],"timestamps":{"digested_at":"2026-04-22T12:30:10.518190+00:00","dataset_created_at":"2026-01-23T20:02:21.962Z","dataset_modified_at":"2026-03-20T17:27:53.000Z"},"total_files":14,"computed_title":"tACS for Patients with Post-Stroke Anomia","nchans_counts":[{"val":32,"count":14}],"sfreq_counts":[{"val":500.0,"count":14}],"stats_computed_at":"2026-04-22T23:16:00.312579+00:00","total_duration_s":17596.844,"tagger_meta":{"config_hash":"3557b68bca409f28","metadata_hash":"7a5322ad4d0af0e4","model":"openai/gpt-5.2","tagged_at":"2026-04-07T09:32:40.872789+00:00"},"tags":{"pathology":["Other"],"modality":["Visual"],"type":["Clinical/Intervention"],"confidence":{"pathology":0.8,"modality":0.8,"type":0.85},"reasoning":{"few_shot_analysis":"Closest few-shot by study intent is the Parkinson's Cross-modal Oddball example labeled Type=Clinical/Intervention: it is a patient+control dataset where the main goal is understanding a clinical condition/biomarker and involves a clinically meaningful cohort. Here, the dataset explicitly involves a neuromodulation treatment study (tACS) in post-stroke anomia, which aligns even more strongly with the Clinical/Intervention convention. For modality conventions, the schizophrenia visual discrimination example shows that when the stimulus is visual (screen-based dots/pictures), Modality=Visual even if the response is manual/vocal; similarly, picture naming implies visual stimulus input.","metadata_analysis":"Key population and intervention facts are explicit in the README: (1) \"EEG recordings from two post-stroke patients with chronic anomia\" and (2) \"8-week individualized neuromodulation intervention using transcranial alternating current stimulation (tACS).\" Task/stimulus is also explicit: (3) \"Tasks: Picture naming task using a standardized set of stimuli; EEG recorded during task execution\" and (4) title emphasizes \"Picture Naming Performance.\" These support a post-stroke aphasia/anomia clinical cohort, a visual picture-naming paradigm, and an intervention/clinical-purpose study design (SCED ABAB; tACS vs no-tACS).","paper_abstract_analysis":"No useful paper information.","evidence_alignment_check":"Pathology: Metadata says \"two post-stroke patients with chronic anomia\" (explicit clinical recruitment). Few-shot patterns: clinical cohorts map to a specific disorder label when available (e.g., Parkinson's, Dementia, TBI), otherwise 'Other'. ALIGN (stroke/anomia not in allowed list, so 'Other' per convention).\nModality: Metadata says \"Picture naming task\" with picture stimuli (visual input). Few-shot patterns: discrimination/choice tasks with visual stimuli map to Modality=Visual even when responses are motor/vocal. ALIGN.\nType: Metadata says \"neuromodulation intervention using ... tACS\" and \"To investigate whether tACS improves naming accuracy and latency\" (treatment effect focus). Few-shot patterns: when pathology/intervention is the main focus (especially stimulation/clinical protocols), Type=Clinical/Intervention. ALIGN.","decision_summary":"Pathology top-2: (1) Other — supported by \"two post-stroke patients with chronic anomia\" and the fact that stroke/aphasia is not an allowed specific pathology label; (2) TBI — could loosely relate as acquired brain injury, but metadata specifies stroke, not TBI. Final: Other. Confidence=0.8 due to explicit clinical population quote(s) but non-exact label mapping.\nModality top-2: (1) Visual — supported by \"Picture naming task\" and \"picture naming performance\" (pictures as stimuli); (2) Other — if stimuli modality were unclear, but it is clear here. Final: Visual. Confidence=0.8 (2+ explicit task/stimulus mentions).\nType top-2: (1) Clinical/Intervention — supported by \"neuromodulation intervention using ... tACS\" and \"investigate whether tACS improves naming\" plus ABAB SCED design; (2) Perception — picture naming includes visual processing, but the stated purpose is treatment efficacy in chronic aphasia/anomia. Final: Clinical/Intervention. Confidence=0.85 based on multiple direct intervention-purpose statements."}},"canonical_name":null,"name_confidence":0.77,"name_meta":{"suggested_at":"2026-04-14T10:18:35.343Z","model":"openai/gpt-5.2 + openai/gpt-5.4-mini + deterministic_fallback"},"name_source":"author_year","author_year":"Martzoukou2026_tACS_Patients"}}