{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T09:13:19Z","timestamp":1785402799178,"version":"3.56.0"},"posted":{"date-parts":[[2026,2,3]]},"group-title":"Neuroscience","reference-count":68,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T00:00:00Z","timestamp":1770076800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"award":["MH104402"],"award-info":[{"award-number":["MH104402"]}],"id":[{"id":"https:\/\/ror.org\/001d55x84","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,2,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  Simultaneous electroencephalography (EEG) and functional MRI (fMRI) offers complementary sensitivity to fast electrophysiological dynamics of EEG and spatially resolved hemodynamics of fMRI, yet previous joint-analysis approaches are confined to fixed task paradigms and struggle with continuous or naturalistic brain states. We FSINC (Fusing Source Imaging based on a Neurovascular Coupling) model, a unified EEG\u2013fMRI source imaging framework that reconstructs cortical activity to simultaneously explain both modalities. FSINC integrates frequency-resolved EEG source activity with fMRI via a data-driven neurovascular coupling model that estimates band-specific coupling coefficients (\u03b2) and accommodates a tunable spatial\u2013temporal trade-off through hyperparameters (\n                  <jats:italic>\u03bb<\/jats:italic>\n                  <jats:sub>2<\/jats:sub>\n                  ,\n                  <jats:italic>\u03bb<\/jats:italic>\n                  <jats:sub>3<\/jats:sub>\n                  ). In realistic simulations, FSINC outperformed conventional methods (wMNE, LORETA) in both spatial and temporal accuracy across EEG SNRs (\u221210 to 10dB) and numbers of concurrent sources (up to five), with optimal performance at\n                  <jats:italic>\u03bb<\/jats:italic>\n                  <jats:sub>2<\/jats:sub>\n                  = 10\n                  <jats:sup>2<\/jats:sup>\n                  and\n                  <jats:italic>\u03bb<\/jats:italic>\n                  <jats:sub>3<\/jats:sub>\n                  =1 (e.g., LE: 0.51\u00b10.24mm; SDI: 0.03\u00b10.37mm; temporal accuracy: 0.95 \u00b1 0.05). Applied to simultaneous EEG\u2013fMRI during contrast-reversing visual stimulation (=5.95Hz), FSINC revealed stimulus-locked responses localized to early visual cortex and stimulus-induced modulation of intrinsic alpha oscillations extending into visual and attention networks, patterns that conventional methods failed to capture. Estimated \u03b2-weights were broadly consistent with prior reports of negative (theta\/alpha) and positive (gamma) BOLD\u2013electrophysiology associations. These findings demonstrate that FSINC enables high\u2013spatiotemporal-resolution source imaging from EEG\u2013fMRI recordings via data-driven hemodynamic modelling, and is expected to be well-suited for continuous and naturalistic brain states (e.g., resting state, natural moving-watching, and narrative listening) that are difficult to interrogate with either modality alone.\n                <\/jats:p>","DOI":"10.64898\/2026.01.31.703060","type":"posted-content","created":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T22:55:10Z","timestamp":1770159310000},"source":"Crossref","is-referenced-by-count":0,"title":["Symmetric Fusion of fMRI and EEG for Spectrally Resolved Functional Neuroimaging"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3032-8827","authenticated-orcid":false,"given":"Jung-Hoon","family":"Kim","sequence":"first","affiliation":[{"name":"Developing Brain Institute, Children\u2019s National Hospital, Washington DC, USA"},{"name":"School of 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