2026-07-09 00:00 United States Papers Foundations & Methods Translated from EN

Preprint: Functional Ultrasound Imaging Through a Human Cranial Window Maps Motor Effector Encoding

Summary A preprint shows that functional ultrasound imaging (fUSI), read through an acoustically transparent cranial-window implant, reliably resolved multi-body-part and single-digit movement encoding in one participant's primary sensorimotor cortex, with maps consistent with classical somatotopy and single-trial decoding supported across sessions; analysis of key decoding voxels suggested different Brodmann areas encode single-digit movement differently. The researchers argue fUSI can map motor representations at submillimeter resolution, filling a key gap in humans between invasive electrophysiology and non-invasive blood-flow imaging; the work has not been peer reviewed.

Why it matters fUSI's submillimeter mapping through a cranial window targets the resolution gap between invasive electrodes and non-invasive imaging — a potential new, minimally invasive recording route for BCIs, albeit one still at preprint stage.

A bioRxiv preprint from California Institute of Technology demonstrates that functional ultrasound imaging (fUSI) through an acoustically transparent skull implant reliably resolves multi-body-part and single-digit movement encoding within the primary sensorimotor cortex of a participant, with mappings consistent with classic somatotopy and support for single-trial and cross-session decoding.

The researchers say fUSI can reliably delineate somatotopically organized motor representations at submillimeter resolution, bridging a critical gap between invasive electrophysiology and noninvasive hemodynamic imaging in a human subject. This study is a preprint and has not been peer reviewed. DOI 10.64898/2026.07.03.735688

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biorxiv.org 2026-07-09

California Institute of Technology Howard Hughes Medical Institute Keck Hospital of USC Rancho Los Amigos National Rehabilitation Center Ultrasound Neuromodulation Motor Decoding United States

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