Samengo2025WBMSEF

Title

Spatial and Temporal Precision in Whole-Brain Mapping via Simultaneous EEG–FONI Recordings
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Authors

Inés Samengo, Alessandro E.P. Villa, Alessandra Lintas

Affiliations

Department of Medical Physics and Instituto Balseiro, Centro Atómico Bariloche, Argentina; Neuroheuristic Research Laboratory and HEC-LABEX, University of Lausanne, Lausanne, Switzerland.

Abstract

Electroencephalography (EEG) and fast optical neuroimaging (FONI) provide complementary perspectives on brain activity: EEG measures neurogenic activity at millisecond-scale temporal resolution, whereas FONI, by frequency-domain functional near-infrared spectroscopy (FD-fNIRS), captures spatially localized hemodynamic responses. To fully exploit these advantages, both modalities should ideally be recorded simultaneously. However, it remains unclear whether the same neural events can be consistently identified in both signals. Here, we simultaneously recorded 64-channel EEG and 64-channel FONI signals from a healthy control participant during closed-eyes resting state. Datasets were band-pass filtered to isolate the alpha frequency range (8--12 Hz), a rhythm linked to functional integration and cognitive processing. We then computed the Pearson correlation coefficient between every EEG channel and every fNIRS channel, yielding a 64x64 correlation matrix. Statistical analysis revealed significant cross-modal correlations for specific channel pairs, indicating that alpha-band neuronal activity is reliably associated with localized hemodynamic responses in these regions. These preliminary results support the view that combined EEG--FONI recordings can deliver both the temporal precision of EEG and the spatial specificity of FD-fNIRS. The observed coupling underscores the potential of multimodal approaches to investigate neurovascular dynamics with high spatio-temporal fidelity.

KeyPhrases

Non-invasive neuroimaging; frequency domain functional near-infrared spectroscopy; fast optical neuroimaging; EEG; correlation.

Dates

Created 2025-05-01, presented 2025/06/04, published 2025-08-17

Citation

Brainiacs Journal 2025 Volume 6 Issue 1 Edoc EF03F05F2
DOI: 10.48085/EF03F05F2
NPDS: LINKS/Brainiacs/Samengo2025WBMSEF